Malicious PDF — malware analysis report

Static analysis result for SHA-256 157792d79c5993e8…

MALICIOUS

PDF

110.6 KB Created: 2021-02-28 21:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 600ef39d072b1c6ffda8df6d93334fcd SHA-1: e48ddc61de69fa0ee8917491a5cb2ab3a71c0a73 SHA-256: 157792d79c5993e82a05666f75fca12616480c552508f1a35d9613e86f1aec53
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and a heuristic identified it as a link farm. The document body, though heavily obfuscated, contains text related to a search query, suggesting a social engineering lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://golowaki.ru/strik?utm_term=which+thrawn+trilogy+is+better PDF link annotation
    • https://cdn.sqhk.co/zobelekivix/Djc7yPN/amazon_music_unlimited_studenti.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/ijgejd1/97848314881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_601fe1b530ce4.pdfIn PDF document text
    • http://wupozigujoruzar.22web.org/huffy_womens_nel_lusso_cruiser_bike_mint_wire_basket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_5fd9788abce18.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/92967848013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_602264f1c24ed.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/gcheohc/32688782281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_6009f775b6f44.pdfIn PDF document text
    • http://udilische.club/zenesemavunorinimuviwiwf6f.pdfIn PDF document text
    • http://zojalokavid.22web.org/open_office_spreadsheet_software_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5fd1dfa4addae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5fca5843670b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/gdjgicw/pikivaloxumofiwowerijez.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/a8iaZxW/bingo_game_sets_for_seniors.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374685/normal_5fce747f61258.pdfIn PDF document text
    • http://classkaod.ru/birthday_invites_templatesm3whi.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_off0001742b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1742B 5408 bytes
SHA-256: b2912bc9e8ed1ca0f7348648fdbec180f64013506c4d4b89d8920990a3d2a728
font_01_sfnt_off000186a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A9 11260 bytes
SHA-256: 4a415f5a490da71c77172504ec1e9dce124b2da1c4c64bc2c846c93cc4785db8

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