Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6439389b6201c7f…

MALICIOUS

PDF

72.0 KB Created: 2021-04-06 07:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b36264412563ced918cfdc4dd29bba3 SHA-1: 9040291167a48d07f142532707154fcb94a09848 SHA-256: f6439389b6201c7f1bd4cafcf7556d09e655f63d405b94afae944ade5b8d6b84
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code 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 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=meat+buyers+guide+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5fe87c9706ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ffc55235563f.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/jofafinategofa_gurozupiruve_selise_zekoja.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/jiEichh/nintendo_switch_emulator_roms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_60241212001f2.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/geburufexa_mewakore_zagebaviligero_vefopowokisezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5ffc5f41cff51.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/7915906.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/anatomy_of_spinal_cord.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/72d9daf1a.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/zosewipubev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6057f181dec87.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/xizenet-lagomex-wosanavivewuw.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/dimud.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/89093775764.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/cKXhhes/dubai_drift_2_free_download.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/7005624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_603064536465c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetekovabu.onlinewebshop.net/97813332916.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/90574487695.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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 5272 bytes
SHA-256: 74469d8f174ca228ae18a545faccaa4bed6ecdd0845bb60ea2b2836771574011
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 11372 bytes
SHA-256: c7312be4024062018748b9d3f5aaa739c4bf7d55073da541f6abdc49e486e47c

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