Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e8aa59f598b97e…

MALICIOUS

PDF

77.6 KB Created: 2021-03-06 06:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c7f3c76cc9205c602e7f99a96371b71b SHA-1: 3a408d3f2f4017fb0bf9a2dc1b1bb4d2e74b5da0 SHA-256: 51e8aa59f598b97eb6bcd1ddc9958e256a23ba43746b8cd7966b0811c0109b9e
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates a potential callback phishing or tech-support scam pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites like 'ponafet.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://ponafet.ru/strik?utm_term=how+do+i+log+into+thinkorswim PDF link annotation
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/jivade_gatez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6040b350529a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479718/normal_5fdda2e123c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fd8d48a06d55.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/2375517.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/lelanakawokol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fe5f4769be43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_600673a608bd2.pdfIn PDF document text
    • https://nonemofolovexuv.weebly.com/uploads/1/3/0/8/130874593/duranitatopel-jumosudot-mutofolazivu.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/b257c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fdb1ae33d6ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5ff309e9ae6cf.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/xobavufaj-gilevaval-mivitix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_6005d1a5e19a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601102e0c933f.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/f30f5a20-3c60-4acd-b1fc-1546cfa6376a/32059890096.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/reinforcement_vs_punishment_scenario_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edc61b7-eccf-40bd-b6d9-97fd3146f7dd/how_to_learn_cashier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8452fe2-839b-4bdc-b740-f774bd79b074/xevirenerenariropopet.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/iq_test_for_genius_only_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebb548d-25b2-415b-9800-b37f7bc7d367/vovanosujekudad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c28544-58a1-485a-a912-618617c59b55/tuvosologezegolavegosa.pdfIn 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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 4816 bytes
SHA-256: 04f3820ae9ddb3808695ebf5e23879d6642cb0e74038a5f5c3dad0e689ec5f1b
font_01_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 10176 bytes
SHA-256: 069764b50058a92435bd12892ea8769f8dd784a38c8e90fa66ee596a977e8a6e
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3