Malicious PDF — malware analysis report

Static analysis result for SHA-256 9645a297e59e0173…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 06:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0046a06de8ac87a4807520612e3b490d SHA-1: 3d0e28b3237e0a2df7c5f0a0cb64b5a059b1340a SHA-256: 9645a297e59e01733ca3642e030ba0b8c5e067b6ded7d9d4ea33d4c1f1b3a4d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=how+to+pair+plantronics+voyager+edge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60341935b0b73.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/Tyih0jh/real_driving_ultimate_car_simulator_hack_apk_download.pdfIn PDF document text
    • http://pavaverijakat.iblogger.org/aging_accounts_receivable_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_602f73bf9a0ea.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/wgjgcd1/dewirano.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/46767427095.pdfIn PDF document text
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/lodilimetusopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_6015308e4771a.pdfIn PDF document text
    • http://befipekawuzader.iblogger.org/28558705985.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/ijbbgjZ/sovamoput.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_6012552e15d4d.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/ZYhcbjg/pajujunutujebujuzevever.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/figidireki/gatovoromitilo.pdfIn PDF document text
    • http://kunimaz.rf.gd/vyprvpn_windows_10.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/83075888194.pdfIn PDF document text
    • http://xefokezutuvij.epizy.com/86593442763.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/mazda_cx_9_android_auto_update.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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 5456 bytes
SHA-256: 2b60f681294c4fbc10800c871b814ff9999004de11faf3bd80f8664294b30c85
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10332 bytes
SHA-256: ffa3636b31d77fe853eff5696a20e0aba32639d7968dfe7c0d16cf0df8128de7

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