Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a5df5c92632326…

MALICIOUS

PDF

74.1 KB Created: 2021-02-18 04:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 275e921a29222a7741a037b088de8428 SHA-1: b1d4465f4ef6dee5888eae4cd7e24b55d99608db SHA-256: e2a5df5c9263232611cd5da1c540cc2307ff6a7fd3634d8bc52720a1a3b3694a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the structure of the PDF point towards it being used to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=private+pilot+checkride+preparation+and+study+guide PDF link annotation
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/kifaveva.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/nipusew.pdfIn PDF document text
    • https://joripulugafu.weebly.com/uploads/1/3/4/3/134318872/zogitu-vunujorudike-mejorewiduwu.pdfIn PDF document text
    • http://update-win20.online/binkw32._dll_free_for_windows_xpcilwn.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/3600980.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/vafuzag.pdfIn PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/zepelosalofalumot.pdfIn PDF document text
    • http://lumasilove.iblogger.org/ultrasound_guided_shoulder_injection_procedure_note.pdfIn PDF document text
    • http://mukoxadetovewo.66ghz.com/70590331574.pdfIn PDF document text
    • http://madifowagerotal.iblogger.org/66744953023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofutigo.epizy.com/fuzusokuzelamewekenuxida.pdfIn PDF document text
    • http://pejezal.rf.gd/77969289484.pdfIn PDF document text
    • http://pozimefenud.epizy.com/achievement_test_sample.pdfIn PDF document text
    • http://vetozidute.rf.gd/henri_cartier_bresson_decisive_moment.pdfIn PDF document text
    • http://jebanodubefa.rf.gd/ruvifejubezot.pdfIn PDF document text
    • http://wevoxefi.epizy.com/apache_netbeans_for_mac.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5564 bytes
SHA-256: eb4760d41a3136abee0f87de444f0f442a6507357944c6173aa7d0bcbb06ca49
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10088 bytes
SHA-256: 5480ca9f3a07f1af47dbb21c2a883a0b8879769b9477202c89af9b8c5ca582aa

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