Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e043d8906c5836…

MALICIOUS

PDF

76.0 KB Created: 2021-02-22 09:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2ffeed1e442e95d4ea79ab4191dddac3 SHA-1: d1d710b9161993aa9aaceb92b2f09d7211e9dd60 SHA-256: c3e043d8906c5836108fb75f25b93ca790e17a2890cced1faa68ccc7b2dc0cfe
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 are SEO-farmed and point to other PDF files, suggesting a phishing or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document 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 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
  • 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=kindly+reminder+email+example PDF link annotation
    • http://health-top.ru/whispering_woods_apartments_waterford_michiganr1fjp.pdfIn PDF document text
    • https://vonemiwez.weebly.com/uploads/1/3/0/7/130776812/dunedupaledi.pdfIn PDF document text
    • http://nowtorrentz.com/fixotelemebapogavetrrmf.pdfIn PDF document text
    • http://experiment.website/what_is_the_area_formula_for_all_shapesxr4kn.pdfIn PDF document text
    • http://csxmoney.info/asking_giving_directions_worksheets5pr2x.pdfIn PDF document text
    • http://polikarmonolit.ru/diturizela8w6i.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/najurojon-gareres-xelaz.pdfIn PDF document text
    • http://philonio.online/fexojudidey8rt.pdfIn PDF document text
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/f507c72969847.pdfIn PDF document text
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/378449ff05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fe36807207fc.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/womirofop/21522783862.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/b._pharm_application_form_2018_tamilnadu.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/pizosoxabo.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/kaputatad.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_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 5068 bytes
SHA-256: 2af0165cf668516e848e106236042ccf5ccba893456309f9951a4b507b4f2ba5
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10408 bytes
SHA-256: b6ef3fcfe11c8ed726299aa8b56e413e49e14ddde14b9cb88c8b27d8c55c5052

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