Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6ccc6de7a089a5…

MALICIOUS

PDF

67.5 KB Created: 2021-02-06 12:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff6862f423e0fd0b65fcecde4d42bcf8 SHA-1: 1b0b7154cc4d6681172cde280ba8d159080c6efb SHA-256: 8a6ccc6de7a089a5c3522fe2e3f4258ca96b1dd71f629bf6e88f8b396fd05c3f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or redirection mechanism. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious advertising context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=base+metals+handbook+pdf
    • http://startbastar.online/agilent_1290_infinity_hplc_manualju73y.pdf
    • https://static.s123-cdn-static.com/uploads/4480393/normal_5fca07d751de9.pdf
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/lajusodobula-fufopebadu-zufowugavafufu-luvotixame.pdf
    • https://static.s123-cdn-static.com/uploads/4415524/normal_6007ed28d6422.pdf
    • http://rezltml.xyz/friction_and_gravity_worksheet_a8gwph.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_600fac2a7f3b1.pdf
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/3dfaa.pdf
    • https://static.s123-cdn-static.com/uploads/4504568/normal_5fc832aa52cc5.pdf
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/vuxinid.pdf
    • http://koteyarn.moscow/kizikitaxotani6s2k5.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_60152446e5366.pdf
    • https://cdn-cms.f-static.net/uploads/4424029/normal_6013241e2d66f.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6014e920d5b90.pdf
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/wuvubabovika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000cbb0.bin
e1d1bcf4b474be9c1f06edf4815f58b5783deac51c80ba6ecabeac72a15e21e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 5440 bytes
font_01_sfnt_off0000de05.bin
d14d9062d6611ca96180f51be135c8ad6591c5a3bbc987123f186531ef3fb83f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 10268 bytes