Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4092a1c784ac96…

MALICIOUS

PDF

67.0 KB Created: 2020-12-21 21:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ff2ca4cfc23007b6a9ab1b579803dd6 SHA-1: ed740d8247cb00848a210c761042f189acd2e0c9 SHA-256: cc4092a1c784ac96a0e4dac696326ae34133c9d0bbde85d6fe247062bb795ae5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading to a malicious site or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=samsung+gallery+tv+review PDF link annotation
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/jigojefujopagumu.pdfIn PDF document text
    • https://mabufome.weebly.com/uploads/1/3/4/8/134880487/477737.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/d9785b1ed92.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/3581552.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/kituk.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/lazupepenomexox.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/3114327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c999fa7-e402-4deb-9398-194d2f1f24b6/shimano_symetre_4000_fl_specs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0873a11f6a4198483d0f6/t/5fc2157f18e72e5fdb1f8e0c/1606555008843/kadegolawuda.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdf4042c954b227391400c2/t/5fdf969fe64f57031541527a/1608488617374/language_curriculum_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471db6c0-d181-485b-b5e9-55e00351caac/89119338701.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_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 5360 bytes
SHA-256: b6cd0d971f874879e07b04ba63db152cd0a90dacde22b32e145d3fee256b4e9f
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 10976 bytes
SHA-256: 5d3ec34fe82b206348333d5486460b2bb771ae5024ce8f3b5d9e29cbd87cf470

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