Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5c1fa41df3ef2c…

MALICIOUS

PDF

72.8 KB Created: 2021-02-17 01:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c90ba111f924d7ccc4eca2ed730a145 SHA-1: a9b31ad6f5597e513a525a1c5116b3bd2792ad35 SHA-256: be5c1fa41df3ef2cda21483376446b41cd63bb41e0bcd5c38f79b0ab7707dd91
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a tactic of redirecting users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=danby+ac+window+unit+8000+btu PDF link annotation
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/nupekupi.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/cihjhjj/mulufodi.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/jf4jiDh/rugiwekoli.pdfIn PDF document text
    • https://xowazusutimu.weebly.com/uploads/1/3/4/8/134880561/xotekeniwatefi_dozujinuxive_viniloweselo.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/tokawiposowubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd632de8ffd6.pdfIn PDF document text
    • http://b4shop.icu/60902886901wrryq.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/jggfkhz/custom_stickers_on_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/vjjpJib/wivuritatalibizaparirazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_600045cde7879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fccf3f4e638b.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/Nnjft55/82348831260.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/ihgjeif/the_archers_2_mod_apk_all_unlocked.pdfIn PDF document text
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/9155711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388178/normal_5fc83506565b5.pdfIn PDF document text
    • http://azorocheat5.xyz/3458a_multimeter_users_guide1qnwu.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ejctDie/carrie_underwood_new_song_drinking_alone.pdfIn PDF document text
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/2259875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5296 bytes
SHA-256: 4e2282191235dd82f98e3e13fde17c8dd1285f2b6d1ee25b78521a2efb007a04
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10412 bytes
SHA-256: 9c8c4732f2838481b9dfa3a80ac7dd3ab4c7b6b0b6c98ed3db2e275756aafb9b

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