Malicious PDF — malware analysis report

Static analysis result for SHA-256 783eab8f229fb537…

MALICIOUS

PDF

80.7 KB Created: 2021-03-11 07:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c31a13800a87a1eeae946a9c29b412 SHA-1: 89583a10f1163a5c8f248e6697c08378d4cc3232 SHA-256: 783eab8f229fb5371133da0fc0d947b6419a6c3a90219a5c51b2c5e6f60b3a0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of external links and the heuristic firings strongly suggest a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=michigan+child+support+income
    • https://cdn-cms.f-static.net/uploads/4486199/normal_6017fbe10fd6c.pdf
    • https://static.s123-cdn-static.com/uploads/4417119/normal_60086891c9d8c.pdf
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff48a3185111.pdf
    • http://barajofa.mywebcommunity.org/automobile_parts_assembly.pdf
    • http://wigisosidika.22web.org/development_across_the_lifespan_7th_edition_feldman_download.pdf
    • https://cdn-cms.f-static.net/uploads/4502464/normal_60252841a2982.pdf
    • https://static.s123-cdn-static.com/uploads/4485810/normal_5fcedd09b8676.pdf
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5fce7c0f0c970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://titugol.atwebpages.com/11842254607.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_e538672c7e6d48bf8d972cf29c4d8278.pdf?index=true
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_482e4d1084fb47bab1258de02a9b0644.pdf?index=true
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_707537dd09504f66ba5b7fdf9afa1202.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_4ca3f80fa94c4c6a97e8e0c38768a834.pdf?index=true
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_db5372a6876646afa8d13680fec6cb41.pdf?index=true
    • http://nodafawujanego.rf.gd/86354900713.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_2fe0a75951fd47a1be0d3eb1f7c4b6c6.pdf?index=true
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_576596286c9c4eca9d01fdfd2c41d903.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_3aeff1140c8342cc90e864ebd3fe2953.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f8.bin
2e286981462bbf8c8ae2b8015fbc78aeb3b5f8ad42bd43cb11b91d5b8e8a9e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5372 bytes
font_01_sfnt_off0001030c.bin
9f120e44780dd695924eb29fedf4f382538fb5a8a1ddb2e0ca3dae5da8f0d73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 10700 bytes
font_02_sfnt_off0001279b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 4324 bytes

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