Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1ac74b4ce75a78…

MALICIOUS

PDF

69.5 KB Created: 2021-02-02 12:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: af6abafda792e1c0341d683ad698beb4 SHA-1: 81d2c628653c1cb703853bcbe05463f441cf7bc8 SHA-256: ce1ac74b4ce75a7895835e72582cca31d6677edddba6774798aad9f9a34ef7be
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/aws?utm_term=android+unbound+xml+namespace+prefix PDF link annotation
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/sigugelene-vilin.pdfIn PDF document text
    • http://axecheat8.xyz/22112115277qya30.pdfIn PDF document text
    • https://nabusaguvelono.weebly.com/uploads/1/3/4/0/134095838/logutufededowipurigu.pdfIn PDF document text
    • http://redit.fun/4785527658696qgb.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/prophylaxis_endocarditis_guidelines.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/b3d74029.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/joliw.pdfIn PDF document text
    • http://betixisu.22web.org/military_time_cheat_sheet_printable.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/munotiji.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/rakamakafijepuv-bevabavalegevam.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/b347eb4c783b420.pdfIn PDF document text
    • https://developer.aIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamajaxa.epizy.com/mesorevobalumege.pdfIn PDF document text
    • http://ziwezamo.epizy.com/wugozeg.pdfIn PDF document text
    • http://sugizujesel.epizy.com/microsoft_visual_basic_programming.pdfIn PDF document text
    • http://gukisika.rf.gd/grammar_test_with_answers_doc.pdfIn PDF document text
    • http://povuputuk.epizy.com/sukijawazora.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 5496 bytes
SHA-256: bf641dd411ed8c0aa699d2531235d86ba3d008194f6afd4070bbd25b11778be8
font_01_sfnt_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 11780 bytes
SHA-256: fa5767950af376df66613243f63d11b2f9c85e0cf85494fd713dc887a012f15e

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