Malicious PDF — malware analysis report

Static analysis result for SHA-256 611b092e1e527fde…

MALICIOUS

PDF

72.2 KB Created: 2021-04-05 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b4721126f62bc4bca3ba0a3f784f07c SHA-1: 9de57595a9b68d987f694d4b27a261e55bc2bc65 SHA-256: 611b092e1e527fde56172ae4d4f1fd19a49af612d0a3007f0e25c7d658b3b56f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated to appear as SEO-friendly content, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for executing malicious actions, such as redirecting to the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=elementary+curriculum+guide+philippines
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5fec00118dc82.pdf
    • https://cdn-cms.f-static.net/uploads/4421218/normal_601b4ee36ca8b.pdf
    • http://pubggaming.online/computer_hardware_examples_for_resume3a2l1.pdf
    • http://wuwudikosegukem.mypressonline.com/21216170873.pdf
    • https://cdn-cms.f-static.net/uploads/4423452/normal_6044cbcdcb438.pdf
    • https://cdn-cms.f-static.net/uploads/4464530/normal_6049c9687a5d7.pdf
    • http://nashremont.site/identity_v_joseph_skin_minecraftbfspv.pdf
    • https://cdn-cms.f-static.net/uploads/4409819/normal_60340f9bc4c0e.pdf
    • http://file-id.ru/neet_biology_notes_in_hindidpmjz.pdf
    • https://cdn-cms.f-static.net/uploads/4384029/normal_604fad540492a.pdf
    • http://sepoxudozixo.sportsontheweb.net/enfermedades_de_moluscos_bivalvos.pdf
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fcb16876b0b4.pdf
    • http://bugosegu.scienceontheweb.net/81502713454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_203ec508cd544738b9f0cb19413f1768.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_303130d8d1724631ba5780c19050de37.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_58ebdf5222fd450da1b65d925b97c247.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_a2b3cde86fdf4bc2bc2f260cc6258305.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_975e99e316b3454087e0a78d34ae3ae4.pdf?index=true
    • http://kadizilurojiniz.onlinewebshop.net/22914164439.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_c4e97613a253418d95d25c1d48f81b40.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_cb5889509ea143048196153d076482e0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin
83601e61f78b3efdfcd2fba7027096d2dc38695c4df51a3c8099273129e2d6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 5544 bytes
font_01_sfnt_off0000ef4f.bin
1165ced0bfa6a358a8a8a9f635cf96b1467c90f03b67cb550ba970f396d7a661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10508 bytes

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