Malicious PDF — malware analysis report

Static analysis result for SHA-256 8baaf336c5967816…

MALICIOUS

PDF

76.9 KB Created: 2021-05-30 05:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59b64a7c8c813f8a78d2ab4d98f5a4ee SHA-1: 0f50977c2c61c7c199824e88a1e7f50dd2c7696d SHA-256: 8baaf336c5967816522b0562a04071c3f08d599b29c33c45d9bdfabd26bac70f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to health information. The presence of numerous external links, including one pointing to 'dafemum.ru', indicates a phishing or redirection attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=what+are+the+newest+blood+pressure+guidelines
    • https://cdn-cms.f-static.net/uploads/4369909/normal_6068bacd34a42.pdf
    • https://takewozijofu.weebly.com/uploads/1/3/2/6/132682119/dofupudipirobuvefig.pdf
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5fe8eb601f05b.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_604d34d8af6a5.pdf
    • https://cdn-cms.f-static.net/uploads/4414848/normal_60401118f2ac5.pdf
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/fada98ed236db6.pdf
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc67da9cb3a6.pdf
    • https://wufavupo.weebly.com/uploads/1/3/4/3/134319323/da4d6a5015edd.pdf
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/588675.pdf
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6039a6ea06415.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67aa116a-3ada-453d-9b87-0e886961335a/78167854840.pdf
    • https://uploads.strikinglycdn.com/files/9d2f16c6-b965-43a6-9791-7ad805c106f4/12332173955.pdf
    • https://uploads.strikinglycdn.com/files/26e9d3bb-9cf9-40a8-bbfc-68ba4507ad89/mawosagogogabexepopano.pdf
    • https://uploads.strikinglycdn.com/files/0998e979-bb7c-406c-9621-6aa1f6d19c4f/sauder_assembly_instructions.pdf
    • https://uploads.strikinglycdn.com/files/4986f6f8-fa4d-4906-ac50-e2b098eedc67/tekonsha_voyager_brake_controller_installation_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0e0befa4-9e4c-4ad9-b58f-980cff3669bd/sopagibaz.pdf
    • https://uploads.strikinglycdn.com/files/9e3f0e03-2ac7-4f3a-9839-d8316776ecb5/21485381445.pdf
    • https://uploads.strikinglycdn.com/files/90dc78ab-976e-40b8-8dea-32070f8112f7/how_do_i_make_my_haier_mini_fridge_colder.pdf
    • https://uploads.strikinglycdn.com/files/8c03db66-2a89-4bc5-84b5-85f0d0f048a3/cub_scout_uniform_store.pdf
    • https://uploads.strikinglycdn.com/files/adb75e74-ef07-410e-a1d4-b80f33c4265e/al_quran_al_kareem_maqdis_b5.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_off0000ec20.bin
11fff5a23ce9a2874ddbc5e681cd0e87bcedbe391e92c2c4ef2c2c642e18e3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5468 bytes
font_01_sfnt_off0000fec4.bin
4b603c89c2409a7dd7567d3234382313922f7be4c1148b0ea8ccc2f0c0c03c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 10964 bytes