Malicious PDF — malware analysis report

Static analysis result for SHA-256 504fbe3130dd1f32…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 06:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2e1658077748405a42d81222db3d9c6a SHA-1: b5042d1e089c61e69b4bfc39d01550b9fee1955d SHA-256: 504fbe3130dd1f32e2b02318aa59567c2381a9122e849f4a0c2c73f8fa443bcd
186 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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=rossi+model+92+parts+diagram PDF link annotation
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/ledevoxasuju-kovudajadorade-vufoge-wixibuk.pdfIn PDF document text
    • https://demegokesikamo.weebly.com/uploads/1/3/1/4/131454383/soburufaj-vidof-luweler.pdfIn PDF document text
    • http://alania365.ru/rhetorical_question_grammary5tvf.pdfIn PDF document text
    • https://lepifopinitomo.weebly.com/uploads/1/3/2/6/132696280/tugubasa.pdfIn PDF document text
    • http://reawolt.online/rinnai_e110cn_parts_listw0z55.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/vubavuz-ritolo.pdfIn PDF document text
    • https://zuzuvisaze.weebly.com/uploads/1/3/0/7/130738998/dfc865.pdfIn PDF document text
    • http://a1metromovers.com/naruto_3_in_1_volume_17t7csp.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/frghqia/dedopanadep.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/ab94cce1c2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jiha7DF/saginunumaxezaje.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/ifjdhdi/40961644766.pdfIn PDF document text
    • https://selubigal.weebly.com/uploads/1/3/4/5/134518702/jabugezer-gepugepe-mijodukibipazeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_cf17feca05a74d5c89333798b927dda6.pdf?index=trueIn PDF document text
    • https://1fc6f8f0-eed9-4017-85f1-b815c88fefed.filesusr.com/ugd/39a0fd_a7c3f424fb404a06bb35810da0785274.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_7e680c7b6f68431da71aa8a441d0b38e.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_66c7352f786f4d9e9ed554f60cecda00.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_aba16c6a7e904659adab1009c1d9f0bf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 5576 bytes
SHA-256: f66b6a10fa2ff252d2f0921e8696dc73815c5da1880540449f388a65d731a78b
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 11048 bytes
SHA-256: 080fdb51e671ab972d8c832d69f09543a5c64756a54dca8f2bbd0b275b47f77d

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