Malicious PDF — malware analysis report

Static analysis result for SHA-256 625d8dd6deaba62e…

MALICIOUS

PDF

80.4 KB Created: 2021-04-02 02:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef258b9a351fc91c478d0599b587ec06 SHA-1: 81dc460663aa7d4d801415583f2d997a49896035 SHA-256: 625d8dd6deaba62ecbb2e46356804b602c3bac3e1ff940768cf5fb698ae6e0d4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Roku ultra remote headphones not working', suggesting a phishing or scam lure. The presence of numerous external links, including one pointing to a URL that appears to be part of a link farm for SEO manipulation, further supports this. The primary malicious URL identified is https://pelibifir.ru/wix?keyword=roku+ultra+remote+headphones+not+working.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=roku+ultra+remote+headphones+not+working
    • https://cdn.sqhk.co/rizijuwet/gdicqjP/rushmore_mall_shooting.pdf
    • https://cdn-cms.f-static.net/uploads/4428341/normal_60613730d8cbe.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_601a596bc046a.pdf
    • https://cdn-cms.f-static.net/uploads/4377112/normal_6026fadc4b0d0.pdf
    • https://cdn.sqhk.co/dutaxato/O2emhiW/homemade_face_masks_for_acne_combination_skin.pdf
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/8107925.pdf
    • https://cdn-cms.f-static.net/uploads/4367944/normal_6044a0e1826d7.pdf
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/26df0622bf4c13.pdf
    • https://cdn-cms.f-static.net/uploads/4426270/normal_603b5bb18cf40.pdf
    • https://static.s123-cdn-static.com/uploads/4494146/normal_6008a55cc4686.pdf
    • https://cdn-cms.f-static.net/uploads/4472198/normal_60655446032ad.pdf
    • https://static.s123-cdn-static.com/uploads/4485001/normal_6002565dd351d.pdf
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/zaxuti-mivabi-razibeku.pdf
    • https://runolenasugu.weebly.com/uploads/1/3/4/7/134765044/84d622ad5c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5c5337ab-e572-48d4-a706-6670608a06ca/dragon_age_origins_prima_guide_free_download.pdf
    • https://uploads.strikinglycdn.com/files/c61a7867-cd2e-427f-9a35-8752bfc8843d/nifobuvefewojegin.pdf
    • https://uploads.strikinglycdn.com/files/8152bed2-d1a8-4348-b2ef-e74bae850722/54214543931.pdf
    • https://uploads.strikinglycdn.com/files/df0c90e0-3dc9-44f8-8bc1-7384ddad78c3/33449173170.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6a.bin
0ad2a06480abb61a101f6b2f5d66364227df3d3bc6b1182493a56789c24f24eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 5420 bytes
font_01_sfnt_off0000fec5.bin
e21bfa3e0f8284411745b848a377ed0f7c0d9f8de8f9860e9c8cafb038096b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 11652 bytes
font_02_sfnt_off00012661.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 4324 bytes