Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d250ed1e38cd92b…

MALICIOUS

PDF

66.7 KB Created: 2021-03-27 22:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 403fc69ad500caf19537acde18447ea0 SHA-1: d275b6f2a1a2221aba394cd8de84790467e2bb9a SHA-256: 1d250ed1e38cd92ba79c4422a75e60716934b17fc1b1bc99438c17c1a8fa941c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and likely phishing-related. It contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, appears to contain keywords related to product usage, potentially to trick users into clicking malicious links disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pelibifir.ru/aws?utm_term=bissell+little+green+pro+how+to+use
    • http://presente-top.store/federal_rules_of_civil_procedure_2020_bookx85n6.pdf
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/dodokosabu.pdf
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/8803032.pdf
    • https://falukanujenujo.weebly.com/uploads/1/3/2/8/132815213/2790240.pdf
    • https://xaberekulokoka.weebly.com/uploads/1/3/1/8/131856377/lumakib_didoveb.pdf
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/fijawur_tigop_vuxavobot.pdf
    • http://1xbets-reg.site/what_brand_of_shop_vac_is_bestt8bdu.pdf
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/kiwewepomejif_tarenonakeri_xurur_sevoj.pdf
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/3bf49.pdf
    • http://madewithsunshine.com/investigation_report_writing_skills05o9c.pdf
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/sikigekujak.pdf
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/5757911.pdf
    • http://pollsexpert.com/thank_you_very_much_in_korean_formalx016w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a9d64f6b-5d7e-49c2-aa96-84a14bbcae58/21457647235.pdf
    • https://uploads.strikinglycdn.com/files/3685690a-316f-4ef3-9ba1-e36cfc587c86/mexibakov.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_off0000ca7f.bin
9dcc2a928fe5892cd451117b664204e98bdc8d86cfb08df39c8d0aa4e3d78fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 5012 bytes
font_01_sfnt_off0000db9f.bin
94925253cfb04dfc14ac8b552999e3111c49efa36d73901619e87d0d83796282
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 9484 bytes