Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bf3b2c700f5226…

MALICIOUS

PDF

72.5 KB Created: 2021-02-19 08:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ef5536f316b0b3d7660c6525b6e0379 SHA-1: a81c2ff8315132b4c1d3284a6e7bd76607d2a751 SHA-256: f5bf3b2c700f5226ab31c4079ef6d492e707f8624137a0589a8abd28ff1d56c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9236

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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/strik?utm_term=trimble+business+center+5.4 PDF link annotation
    • http://zozemumole.iblogger.org/dakodiwuwanedepegetison.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/8968367.pdfIn PDF document text
    • http://alcexpress1.xyz/72741748404fcoz8.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/4gdAjiu/weather_forecast_for_tomorrow_mornington.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/8265669.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/613239.pdfIn PDF document text
    • http://tehnotop.store/26717471613hjex2.pdfIn PDF document text
    • http://hr-insider.com/chhota_bheem_pirate_attack_gamenw4f8.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/1163201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://timivaferegigor.rf.gd/batejavaromevaregesof.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/42694240265.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/6171850581.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/vejariborofuvulu.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/irrigation_department_sindh_jobs_2019_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/qld_electrical_licence_renewal_answers.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 4840 bytes
SHA-256: ad34ee2f43fb677463505f6ed511c5bb4016defe9d7b5aa37bfa7896c5d00492
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11096 bytes
SHA-256: 6b4de3ba8901fb6261ad129f7bf11717d08fe96623a1207596e7e9c7755e0928
font_02_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2