Malicious PDF — malware analysis report

Static analysis result for SHA-256 428ed6b18d9fb523…

MALICIOUS

PDF

71.0 KB Created: 2021-02-20 14:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 40d4393f12edd375bab2ce6209e5043e SHA-1: edd0f39b6b97dfdcbbde5cdcf2e81b0a2752b2b6 SHA-256: 428ed6b18d9fb523799bcd54d696e4a63333884ca14d07540e19fd3b99de6580
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to IKEA instructions, likely to trick users into clicking the embedded malicious URLs.

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/strik?utm_term=ikea+malm+single+bed+frame+instructions PDF link annotation
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/9905403.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/tunutomuj_gukal_lepeganafif_fowekama.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/hiRCjUM/sanegiz.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/j8ZAvjf/lyft_driver_california.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/47836855814pkh9.pdfIn PDF document text
    • http://kayikciakademi.com/caractres_spciaux_clavier_androidu88tt.pdfIn PDF document text
    • http://boxberry-24.cc/sudoku_easy_puzzles_online6t0gi.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/pevax.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/nhbihib/batupov.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/8hehjgi/costume_store_near_me_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/khevhbl/10212882990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_602d4c6b1aed2.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/IHQifbb/win_diamonds_for_free_fire_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5fd7a8653c8d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_6025328d65eca.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/DigHer8/strategy_games_online_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fe11b182760e.pdfIn PDF document text
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/873be19d055108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevajem.rf.gd/how_bad_is_the_storm_on_jupiter.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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 5480 bytes
SHA-256: f48935c84d044f808129da59821707a4509d1d4de26936d0623f4b6c245af537
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10356 bytes
SHA-256: 25352863432ec7749832eb8dd25c49b5f6cc4fa39a0b684167c73f1b74d891c4

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