Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb2aea7bd735f20…

MALICIOUS

PDF

63.0 KB Created: 2021-02-14 18:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 7e388b32793499bcaa2921b82b0b0879 SHA-1: 45c04d5226fd67ee98aceeafc633e1bb8b02097f SHA-256: 4fb2aea7bd735f2082dfb6e97bb6787b1a7dabf353e246ff93b2904a51cd72bc
186 Risk Score

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=4.3+exponential+growth+and+decay+worksheet+answer+key PDF link annotation
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/1387695.pdfIn PDF document text
    • https://tekejixebosij.weebly.com/uploads/1/3/1/4/131452745/94564.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/Etdghhb/meme_generator_free_zombodroid_ios.pdfIn PDF document text
    • https://lekomitigukajar.weebly.com/uploads/1/3/5/3/135345412/3169925.pdfIn PDF document text
    • https://duruzamuxe.weebly.com/uploads/1/3/2/3/132302842/379bddee076a.pdfIn PDF document text
    • http://kukushpa.fun/chrome_android_bottom_navigation_baricmc1.pdfIn PDF document text
    • https://kofavuzaxo.weebly.com/uploads/1/3/0/8/130873868/4cfb80ddc8c.pdfIn PDF document text
    • http://azules.ru/65859608518vusxw.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/sogodamokuleb.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/gjjehgm/54288536876.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/wIigNhg/futoxubomipi.pdfIn PDF document text
    • http://zoosalon.org/immigration_uk_questions_and_answers9fh2o.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/jg5Cid6/wind_waker_gamecube_hero_mode.pdfIn PDF document text
    • https://gagodizuw.weebly.com/uploads/1/3/5/9/135965264/logopawa.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/nokurarewolamewa.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/riweleju_lagamitatuvalu_jezekiwi_sebolid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxopemuvoxu.rf.gd/xurumojajonimovezize.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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 5848 bytes
SHA-256: c2e3a5745343f13cb2c14eab8a9deef5bf4b9bb8922b7c8bfc2cb297103e1733
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 10024 bytes
SHA-256: 214c9b665b226fe0c7fb107640f5b4589a140a5d436aa29b40869b233de8d284

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