Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd8e3b4c1a07689…

MALICIOUS

PDF

76.2 KB Created: 2020-11-25 05:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11e6f8b26450919cccd3ea74bc331388 SHA-1: d333706b873d925383cb1d21363675cba514b653 SHA-256: dcd8e3b4c1a076897fe335f5c7493a0aad4ca3a55abef51db62ee97c9c2cdfe6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one points to a suspicious URL that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect the user to a malicious site.

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://trafficel.ru/123?utm_term=transport+phenomena+pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/9976471.pdf
    • https://lokenomosotim.weebly.com/uploads/1/3/4/4/134499182/bawal-wimez-puwiw.pdf
    • https://cdn-cms.f-static.net/uploads/4416131/normal_5fadf72adee67.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lafomu-fowesutom-dabikituduxun.pdf
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/wobelep-mogekutitaguz-zefet.pdf
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/527491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sinamozagemoger/sensory_evaluation_techniques_meilgaard.pdf
    • https://s3.amazonaws.com/nowokil/strike_force_heroes_unblocked_66.pdf
    • https://s3.amazonaws.com/voxazedisula/chewy_coupons_2018.pdf
    • https://uploads.strikinglycdn.com/files/a2f01f8c-05cc-4b3a-b29e-eca05bd8fec7/ocl2_lewis_structure_polar_or_nonpol.pdf
    • https://s3.amazonaws.com/jamokaroxoj/viputifogatowamarudubof.pdf
    • https://s3.amazonaws.com/vavapekadoliti/larekodul.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_off0000e8f6.bin
39819ce362c5140ccfd26c62786f2a406a3f76a0a5388fc82b31849bcd2311f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 5200 bytes
font_01_sfnt_off0000fa76.bin
31106ca4e129b83f5544f359bdc3f6ca748fd4bb9b8a0516d2002b02d40a83cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 12444 bytes