Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1df91bf4ff4ac84…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 09:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b949d5e43f91430d4b91bbb8b91bd08 SHA-1: 21b08a35b9d3b8a10f6f7c884d6da2843afc2a7b SHA-256: a1df91bf4ff4ac84ff526a1cd9d68b42db844f2a8d96af9c0307cd4ac1749ad4
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, and a visual download button lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of these elements strongly suggests a phishing or malware distribution attempt.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=empower+big+lots PDF link annotation
    • https://cdn.sqhk.co/detatakev/Zja0jGd/13008905063.pdfIn PDF document text
    • http://hiziryigit.online/52142159068y1tcy.pdfIn PDF document text
    • http://getallcreditscores.info/absolute_value_review_answer_key5wm68.pdfIn PDF document text
    • http://life50it.pro/suralanurafenapuxedamudw9kan.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/mobarupubete0gyaf.pdfIn PDF document text
    • http://usacreditreport.info/giant_realms_battle_arena_mod_apk4d8wy.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/adiheib/magoxefanobijeniki.pdfIn PDF document text
    • http://virnet77.ru/storehouse_food_bank_glasgowzwq5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_601b9ac27f6ad.pdfIn PDF document text
    • http://maxist.ru/metric_to_awg_conversion_tableru7vd.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/gdjg9hc/41960482075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_601794d41dda0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokamusosimabo.rf.gd/internet_manager_2019.pdfIn PDF document text
    • http://jilutuve.rf.gd/26856559365.pdfIn PDF document text
    • http://zetazuzetebutef.epizy.com/mokoparexekekamomuge.pdfIn PDF document text
    • http://zalujagenonu.rf.gd/xarumonezixugu.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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 5120 bytes
SHA-256: 594fb0ba3cfd2f7196d11f0a008acacca28bf9852a7f0442c945eb9c58693ee2
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 11420 bytes
SHA-256: 8f20eca053f7f0d5312e8708148267bfd1e3c4daad705fd3b5c5c1c408287e3f

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