Malicious PDF — malware analysis report

Static analysis result for SHA-256 2062a345da9a352a…

MALICIOUS

PDF

82.8 KB Created: 2020-12-15 03:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58c78baa0e08813fbfc03c28b65e86a SHA-1: 705eb70a1262a2a69300e7eb1be0232f3fbdd0d4 SHA-256: 2062a345da9a352add29c1f8d2b613211afbc8484f5d21c7b2e60bca1361ba47
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting a phishing or scam campaign. The primary malicious URL identified is https://traffnew.ru/123?utm_term=foolproof+module+8+answer+key, which is likely used to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to an 'answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffnew.ru/123?utm_term=foolproof+module+8+answer+key
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05a3d7f552.pdf
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/musezufatefa.pdf
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/nuxaworewosajut_rusesaxazo.pdf
    • https://mukaperu.weebly.com/uploads/1/3/4/6/134649449/rowogazegoponin-misewojosoz.pdf
    • https://godusepes.weebly.com/uploads/1/3/4/8/134899552/3684902d22a7d.pdf
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/jateja.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_5fc37c83d3c1d.pdf
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/364842.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf62cfcb3e0f5771474cae/1606378193090/time_function_map_generator.pdf
    • https://uploads.strikinglycdn.com/files/b8bc1131-3f25-4a2f-8c91-9430cd5f79b0/kobupimajuxomigumuxato.pdf
    • https://static1.squarespace.com/static/5fc589e9084698658e7dc178/t/5fcad9ae85bc3a28a6fe2f3c/1607129519580/37858620475.pdf
    • https://static1.squarespace.com/static/5fce7adeb0d0046e84609e63/t/5fd6734effab5d3c56fcdf44/1607889743023/6065330014.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_off0000fc40.bin
4579bcf8e55d0e037ce8fe89786a1e452830f7ce60b88fa576f26db009eb4f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 5596 bytes
font_01_sfnt_off00010f4d.bin
c35cb5b62d451944ecddaa8d2192e2427c2f7dfedd0d2cff38c2c8c932c0a4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 14916 bytes

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