Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff7c1e83ea5716b…

MALICIOUS

PDF

68.5 KB Created: 2021-01-01 19:34:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e7197f9d18e2f4684028e5853d0b8a53 SHA-1: be8721e4d082799880c08a9c1eb4c09229ed0018 SHA-256: 4ff7c1e83ea5716b905e002d5437c63f7245fdff293c2a9d8e3fde369fbde5ab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

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://traffnew.ru/strik?utm_term=zigzagoon+galarian+moveset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f873cac0286f.pdfIn PDF document text
    • https://musufofijadora.weebly.com/uploads/1/3/4/8/134888277/porimobezo_vakuwekesat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f8ffe5b96c50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5fcc853eec673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fe82adedd780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd127fba153b.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/wutogugej/18841043189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e0873d-61d1-4f88-bd75-23828b23a258/gotuseduj.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/ramadan_calendar_2018_uae.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/bubble_sort_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/88115572598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0495925d-2251-43c6-9b69-8a25bb8630d0/80240557584.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/zijosevenidalitozejif.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/the_apparition_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/pakowesexukufiz.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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 5072 bytes
SHA-256: f4e2dc16d9394106e453fccc2187b413ae9bd9fb42a0d2e85405b2024095b26c
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 10308 bytes
SHA-256: d762a0e530ac60f4eb6475a87f5d2f2ead1977838f8414a4e09e11f49f0679d3

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