Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9e73a3923fab49…

MALICIOUS

PDF

66.1 KB Created: 2021-02-19 17:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f2b5446c193d4cbb4631286c621399e SHA-1: 916e255079fe3072328be0f691762eb8e4c5ad72 SHA-256: df9e73a3923fab491dde9e7f4e35b791f5bbebc55292008390afe2e2ce3621a5
186 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. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=maps+kauai+hi PDF link annotation
    • https://cdn.sqhk.co/jasurisunav/M5iaPf8/31022028539.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/jekapoxokoxisikefep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_600a7459329ba.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/gfghhdk/51604707138.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jgbgjGq/vafalaxenoniverapiz.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/a0d4fa5c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_6002bca0a91f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_5fe2cc28c718d.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/bikubefufimivuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/idrgfjg/nintendo_shoot_the_duck_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_600f2572b87f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewilojejesuj.epizy.com/attachment_style_theory.pdfIn PDF document text
    • http://labutebumir.rf.gd/jegasoxoguzebe.pdfIn PDF document text
    • http://lugukejuraxa.rf.gd/adobe_photoshop_elements_2019_win.pdfIn PDF document text
    • http://rumeponiwogegok.rf.gd/baby_animals_esl_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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 4848 bytes
SHA-256: b4b457e1e06811736a34746a1b0c21541cbc596eafb0d66d4ae7a9dcb19ab10c
font_01_sfnt_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 10596 bytes
SHA-256: 7bd0e66f71fb67b6787aebcd72d64dcf45d35a8a9bf2217068c06582875f5ca6

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