Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dc50ccfb426a5b…

MALICIOUS

PDF

85.6 KB Created: 2021-04-25 01:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 755493b016cab1cb072774ca80adf656 SHA-1: ecb05e8321192d13edfffa9eebe1d01d11b66b0b SHA-256: f2dc50ccfb426a5bda996d506dc239bf2b19afe805e6014823e161a0d2454d20
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no specific script was extracted, the structure and URL findings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=is+the+game+show+the+wall+coming+back+in+2020 PDF link annotation
    • http://fresh-ita.space/long_form_marriage_certificate_nova_scotiay2qwg.pdfIn PDF document text
    • http://probmaka.tech/whirlpool_refrigerator_manual_wrs322fdab05tp6jt.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/sowunofowuvi.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/3587bcdfbc67.pdfIn PDF document text
    • http://excschool.ru/brunner_and_suddarth_14th_edition_study_guide8f6ee.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/wapoje.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/2181690.pdfIn PDF document text
    • http://orbitan.fun/33734839465so2y7.pdfIn PDF document text
    • http://molotkov.site/vutefivazekinsto3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/182b866b-45e3-4f7d-a829-de2191e053d4/vejimezaruwuzedonenologit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ae0a9a-d66e-4a9c-b5a0-0d9fc6c42812/71472309185.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_cbb1b3d1990e4a7e937a12c1007c5312.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_0e5269fefb574895b259a4d7a96a77f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81efd8b0-9071-4c94-aaec-e1f6a29b2757/56041127392.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_767a509276a14077a9ace428562307be.pdf?index=trueIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_35f4e98f6158455c986d2b45ae462a30.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_a34abe91e9fc4636a19e07d1d547915d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7539a2c9-54c2-4439-b1ad-0200f5e5f258/64819144254.pdfIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_de61961b68b749eeaf9158ef082f66e5.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_a6653c3a6d09491faf4c57a658916508.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_cbe6429d50774eb8be2de0d94df3d493.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_9f34510ea08f457f94643424ec1acffa.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_7c74d10543cf4a65b7916d82ffed62d1.pdf?index=trueIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_e3b7c3c99628400e9a46cfe93dc248c5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 5412 bytes
SHA-256: 603d8190bd4af12f665baa0017b546ad24a632f34c03756e82eec39b9767c16b
font_01_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 11808 bytes
SHA-256: aa42f4eb228a32f0780bf64ff855835f754c9a52f34e9f31b668d7b1c6130c82
font_02_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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