Malicious PDF — malware analysis report

Static analysis result for SHA-256 9401cf6cddfcd388…

MALICIOUS

PDF

139.8 KB Created: 2021-02-27 08:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a789dcd4762f2bef5a5e30ba4bd041d0 SHA-1: a74cfb9a0933da39247c164d139966c9d8cfbce5 SHA-256: 9401cf6cddfcd388ccfc1cc1e3eaa2a02ea588ee9716c10c0c293ad6c0f31339
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing and an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/xozidegix.pdf.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/wix?keyword=su+binary+update+fixer+apk PDF link annotation
    • https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/xozidegix.pdfIn PDF document text
    • http://itprod.space/jufik36o6c.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/vopanaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fe70bf2eed89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482407/normal_60090d434e87a.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/bamalemugufodit.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/wivabojarizowofo.pdfIn PDF document text
    • http://toppiksnack.xyz/oxford_geography_book20gg2.pdfIn PDF document text
    • http://alexandreablog.com/bikini_body_guide_food_plan8z2ta.pdfIn PDF document text
    • http://vakexuk.22web.org/vitiretolutes.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/laremu-vevavisowo.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/tamovagag/futanamobuket.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/nuclear_spin_quantum_number.pdfIn PDF document text
    • http://xuperag.epizy.com/arabic_audio_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/xadosazogabes.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_off0001e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E875 5300 bytes
SHA-256: b86afcc5a117923ca0f2bbfdf439538638c4ba2900171625a9f9d29f1f3c21fb
font_01_sfnt_off0001fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA9D 10984 bytes
SHA-256: 00f725575a0487dd302fa37b420b54ba055775c92b4988af3ddea5650d45d5fa

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