Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2932d74526d471…

MALICIOUS

PDF

82.3 KB Created: 2021-03-16 02:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d999b536dc12043dff97657e6453d9 SHA-1: 1ac59320b6c1777bca40bb5880f06443a75eb8fc SHA-256: ad2932d74526d471dc919c935901a4c6aaf17679fd856a0ddb8484d277c90ed3
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 large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect users to malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=two+phase+method+linear+programming+maximization
    • https://pegitizikaze.weebly.com/uploads/1/3/4/7/134730703/a5dcb1db0.pdf
    • http://saxobufamap.22web.org/794873524.pdf
    • https://cdn.sqhk.co/gojogefe/r4Pgjia/superhero_appearance_generator.pdf
    • https://cdn.sqhk.co/tedogegez/dWgevic/cost_to_wash_clothes_at_a_laundromat.pdf
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5feb08b4b6ec0.pdf
    • http://bapupozizevose.22web.org/woduwobobajewixidiweb.pdf
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/siretesu.pdf
    • https://cdn.sqhk.co/teketerep/fxrruig/samsung_s7_notes_backup.pdf
    • https://static.s123-cdn-static.com/uploads/4414696/normal_5ff581942092d.pdf
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/begikam-lezokabafuki-dusafudox-fivudap.pdf
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/folufam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_a3752c8ea5fa4ecaa5d8bc6e8f2e0023.pdf?index=true
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_b40fce430a374414b358e65ee600f70e.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_24570080ec9a4aecafcd778c053386b8.pdf?index=true
    • http://sedovama.rf.gd/clear_score_credit_report.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/lagu_chop_suey_system.pdf
    • https://s3.amazonaws.com/lovomijelun/rifojenizolitidulobof.pdf
    • https://s3.amazonaws.com/batoragubukepo/69478228766.pdf
    • https://s3.amazonaws.com/bezorito/tepokomiv.pdf
    • https://s3.amazonaws.com/wejuvono/kuzolajebixesut.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin
4c926fd98bf200370e1f9a131064ff4a47f9f8230e051f1751de152ac6f388f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5532 bytes
font_01_sfnt_off00010157.bin
f71fb4e48c125e3746c95b9a54d509eaae56fad1b0f86e68d6c936b543537f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 10800 bytes
font_02_sfnt_off000126a7.bin
4df0d9c347762b6f342075c20489a734af01dbbab0c86c2c07b37e080450e225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16092 bytes

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