Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ccfe3942428c64…

MALICIOUS

PDF

69.8 KB Created: 2021-02-06 13:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 751c03723b58684d17ea2662967d476f SHA-1: 45d0c2deea4ac476c80b91f28a5ffae6e67146d0 SHA-256: c5ccfe3942428c6482f1940c05eed65dbd28a9cbea98bfe0c2220d70686809bb
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 numerous external links, identified as a link farm, with one prominent URL leading to 'seumenha.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's 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://seumenha.ru/aws?utm_term=g325+biographical+information+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422620/normal_60183cdfbab37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fe2be59ebf26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_60049e560be7d.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/kofulimek-fekiz.pdfIn PDF document text
    • http://vejefulolite.22web.org/c_manualresetevent_vs_manualreseteventslim.pdfIn PDF document text
    • http://kivedunorujuw.66ghz.com/ikea_bed_sheets_floral.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/diwitapezu/84265777096.pdfIn PDF document text
    • http://fegozijagomon.rf.gd/mijorogixefogativ.pdfIn PDF document text
    • http://lesiterifok.epizy.com/disimosabebagu.pdfIn PDF document text
    • http://zilajib.epizy.com/13810885320.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/bibabawunipinonewuve.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/40838164660.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/65327556289.pdfIn PDF document text
    • http://ropanosuge.rf.gd/html_form_default_submit_button_enter.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/69605443972.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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 5840 bytes
SHA-256: 5ec8e28844900919b2269bdf63b5648d95cfbee418f6c8dc8e79cd5c686d2c0c
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10792 bytes
SHA-256: 7a6918f5e663abe3dca43334ca4d0a7c36ad2ccdcff79fba23d99d2c2cbc17cc

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