Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f8646b7c48e92e…

MALICIOUS

PDF

75.6 KB Created: 2020-12-03 03:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 870cf0eb7a285894d6ce8cf8023bdb6b SHA-1: 422ecff87e5100034d27cd06c949a6fa6c069677 SHA-256: b1f8646b7c48e92edf7f6de045650021c9c17a3d3d7984f011abc1a9fe440f61
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to tax forms. The presence of multiple external PDF links and a critical heuristic firing for malicious redirectors indicates a phishing or malware distribution attempt. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=2015+form+il-1040+instructions
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fc81b13e4fc3.pdf
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/64c6a4d9c53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b93e7e3e-c821-49fa-b4c0-4acc523b0dfe/vonukidixup.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf64ea7acac6192ab8f95c/1606378732636/tera_timescape_guide.pdf
    • https://uploads.strikinglycdn.com/files/dfc8c8d4-dabe-4995-baa7-a05cbf67997a/16162330024.pdf
    • https://s3.amazonaws.com/giwurode/mary_beard_bbc_documentary.pdf
    • https://s3.amazonaws.com/wulotugadag/3m_scotch_tape.pdf
    • https://s3.amazonaws.com/mejobu/97330613426.pdf
    • https://uploads.strikinglycdn.com/files/5512417f-3a21-4ef7-9cc6-c169021b3e94/tepudutitexidanoto.pdf
    • https://s3.amazonaws.com/mesixadelomomo/blackcore_edge_testosterone.pdf
    • https://s3.amazonaws.com/lijopavexanuse/omro_high_school_phone_number.pdf
    • https://uploads.strikinglycdn.com/files/08a690fa-f72f-4589-b488-f0ab577d4f2f/lombriz_roja_californiana.pdf
    • https://s3.amazonaws.com/fejififimaketo/vw_jetta_owners_manual.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_off0000eb74.bin
417ce655a61d9d270ed2d0cecdbe0125bb9d2480494b64594b5d4752d2c9561a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 5292 bytes
font_01_sfnt_off0000fd7c.bin
71ef324133b962556a8ed02d4a73de18c7d89afc35c3c18c5a6553b272e5b999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 10776 bytes

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