Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dd83b2625640f7…

MALICIOUS

PDF

80.9 KB Created: 2021-02-20 14:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 811a0ea78b129a316cf92eddbbd32e5a SHA-1: 191bfb3e3b05798b63c612d7d7294141acb96c69 SHA-256: a5dd83b2625640f75fbf30d5c457fb1de504d5420f4a803cefafcc4dacf8b2c8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/wix?keyword=racing+games+google+sites PDF link annotation
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/3806121.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/lDhgggW/beat_cop_game_search_car.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/DhiijDi/lock_screen_wallpaper_anime_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/SoNjhjh/dumapudiletegogivuvutu.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/nijowaderu-wexokipet-maxipexuz.pdfIn PDF document text
    • https://cdn.sqhk.co/gizadomoto/ZhiZagg/kujowave.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/g2HQidl/3854429907.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/1282532.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/byijCjH/switch_game_box_art_template.pdfIn PDF document text
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/2ea9179b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxegowanav.rf.gd/olympus_tg-6_vs_tg-5.pdfIn PDF document text
    • http://dobupefibukin.epizy.com/xifapojazapajuzonu.pdfIn PDF document text
    • http://serumisa.epizy.com/sejawidozivozagipunip.pdfIn PDF document text
    • http://kabemetuva.rf.gd/36304106893.pdfIn PDF document text
    • http://jasagedonemope.epizy.com/kitutusatukazubolajesuz.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_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 5032 bytes
SHA-256: b5c914aa810410f4b2416216d8a0430d27a3ac95119407cfa2f44961baa6afc5
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10728 bytes
SHA-256: 342d5bd59938afea7e7072858757ed57531dcbfcd5e73e474e1b651160b89d3f

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