Malicious PDF — malware analysis report

Static analysis result for SHA-256 f017a4f6591b1a29…

MALICIOUS

PDF

77.1 KB Created: 2021-03-01 22:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a3be9ec0975a9bd47baec7f1e3414d23 SHA-1: 99f7caa853c08561810af14dd27bb170c880e624 SHA-256: f017a4f6591b1a298c6243e8f5f3ecf4e241b9c8248c9fbd760f7ed9d03568b3
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 domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily corrupted, contains text related to product listings, suggesting a lure to a malicious site. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to potentially harmful content.

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://botokaw.ru/strik?utm_term=beats+solo+2+replacement+ear+pads+pink PDF link annotation
    • https://cdn.sqhk.co/koditisalupe/jhf8S4w/13725134914.pdfIn PDF document text
    • http://aycotoro0.xyz/zoguwataxejotiw1uvu.pdfIn PDF document text
    • http://bandalet.club/fotolivonojelildq4.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ihdiaje/tixizeze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_6011797267c17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5fcfec20b3ee5.pdfIn PDF document text
    • http://alania365.ru/sinisalejovifitifurifakmuu7c.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/fjajahb/christmas_mandala_coloring_pages_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/igqLAig/57139858088.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/oPgeEji/xaworuluxibajuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_6025c0ffacb14.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/a0jeCbv/62473665510.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/diary_of_perpetua5fvs9.pdfIn PDF document text
    • http://mstmail.space/zegogu34cmg.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/fetakulebinepazesugisetog645m3.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/d5Lihji/gugaras.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/fenatagazise/jesifutekazoxuderozig.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/petty_cash_accounting_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/vupusefedebotufugaxinas.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/both_either_neither_worksheet.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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5464 bytes
SHA-256: a8b640d501332b341b2860dd9b18e0a6c99266f3768f2fb21760f80877b48269
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 11084 bytes
SHA-256: 0aa7dfbc5c8c07afd833c544812a4396c666017c279a8b80c0a8c60502091590

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