Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4972f13db7aa5ca…

MALICIOUS

PDF

70.1 KB Created: 2021-03-17 23:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6ade1b5d9a87829a7f218ef7c8fab6 SHA-1: afe6b783296d982d1f9292bc41ed8cd2400b79ad SHA-256: a4972f13db7aa5ca6c26b7a2189428c7aa76209469ebadcc79285292750c0fd2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in phishing or to distribute further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to direct users to potentially harmful sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to exploit users via web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://vilenefex.ru/aws?utm_term=personal+pronouns+worksheet+pdf+grade+1
    • http://ketorebagibof.22web.org/waxukedibexijil.pdf
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/1472302.pdf
    • http://xukoxulopimob.22web.org/legumuwawinafubim.pdf
    • https://static.s123-cdn-static.com/uploads/4530457/normal_5ffbaf4352e5d.pdf
    • https://jexepasevotapak.weebly.com/uploads/1/3/1/6/131606223/9480767.pdf
    • https://static.s123-cdn-static.com/uploads/4379377/normal_6001bbd243cbe.pdf
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/9346475.pdf
    • https://cdn-cms.f-static.net/uploads/4526930/normal_5fd959e989155.pdf
    • https://cdn-cms.f-static.net/uploads/4499629/normal_5fdaeee9a07b8.pdf
    • https://cdn-cms.f-static.net/uploads/4390057/normal_60177698861d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_d158fad96d7f4973b82aae47a6de4a95.pdf?index=true
    • http://nidawijonag.rf.gd/2004_dodge_ram_1500_5.7_l_hemi_specs.pdf
    • http://bozisiruvaletun.rf.gd/gudetenemeneforuzufutix.pdf
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_5f7e21dd72ec401a8d1942eafbe1adc0.pdf?index=true
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_b962be3d6dd8484780a10954b898465a.pdf?index=true
    • http://vozerurivuboki.epizy.com/jedinatabetivuded.pdf
    • http://riwefub.epizy.com/49560992299.pdf
    • http://tunivepusage.epizy.com/presentation_design_software_free.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_9855f802ad344ed5a1aba40a5f7a159f.pdf?index=true
    • http://sufotef.rf.gd/how_much_does_ac_service_cost_at_valvoline.pdf
    • http://pixajofa.rf.gd/zisakevonur.pdf
    • http://bukinajomo.epizy.com/pasefekaguriluxorutivifu.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57c.bin
8678bfebe3b6cea46a97c1ef7d1305539af2b5518cf1639681ce77b3495d9fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 5512 bytes
font_01_sfnt_off0000e851.bin
3dec521ef2e0fef09c9e5f1fb010042c32b5781e62a8cf7cff79409dc1a469db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 10312 bytes

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