Malicious PDF — malware analysis report

Static analysis result for SHA-256 457f983c6fa82ca0…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 09:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ccdc94cf1ebe9c4a487cd0b363977a43 SHA-1: 6fb85b4c79d0bcb12d086a8037e1916212e76c3e SHA-256: 457f983c6fa82ca08c8030e9e1ba25f9324ad1ccc2aff4af12431740d9dedfe7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'award', aligning with the heuristic findings of a link farm and external URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/award?keyword=orpheus+britannicus+pdf PDF link annotation
    • https://cdn.sqhk.co/rorezina/gPiagh5/1209879208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_6022339c2eaca.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/GqhhifZ/jibukuxebujozagaxulo.pdfIn PDF document text
    • http://wijulewotolag.22web.org/2376075838.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/9ZKgehc/18331353708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_6044d1c9c365a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5ff788daa7178.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/dKjbiRG/vodafenejanufaminalil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5fdc573457d30.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/JlFjh1D/fexarunavorefawufubenaxep.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1CGDTeS/26822211337.pdfIn PDF document text
    • http://itgermany.net/84391604424hw6u7.pdfIn PDF document text
    • http://lollipopa.online/6078785368yw0cd.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jMihDif/police_car_simulator_game_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5ff4c9374d78b.pdfIn PDF document text
    • http://clipshd.design/36594745123yna99.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/hrhiTqG/pasebijilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/godigagupa.pdfIn PDF document text
    • http://wapuzega.rf.gd/75866590833.pdfIn PDF document text
    • http://rumeponiwogegok.rf.gd/remufumusudijokaf.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/48094448302.pdfIn PDF document text
    • http://fujesotes.epizy.com/appium_desktop_server.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/harvard_business_review_managing_oneself.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5376 bytes
SHA-256: 7d293e26396bdf462699eaffdb6593f269c382e87387b21b21a3caa1c681ac52
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 12120 bytes
SHA-256: 538ec58b48d6b3d5557159d9d25c780c81904142272954ef2e744ae2b1c7c9e8

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