Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9155b306a8deded…

MALICIOUS

PDF

69.0 KB Created: 2021-01-11 07:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f2da27656d2291d64ed5db399649d20d SHA-1: 01fa10d1e8c34334ee5c2979e2f5fb603c04d026 SHA-256: c9155b306a8deded84fd276e4132e7d4b4e669aa897c2459b4bf43ec187b0f8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffine.ru/aws?utm_term=social+media+strategy+framework+pdf PDF link annotation
    • https://site-1171969.mozfiles.com/files/1171969/br_style_passport_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5fedab6da5141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fe1d090632d9.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/gradeup_app_apk_latest_version.pdfIn PDF document text
    • https://site-1178961.mozfiles.com/files/1178961/takabojafejipax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd6376f92693.pdfIn PDF document text
    • https://xopoloxunevagig.weebly.com/uploads/1/3/1/4/131406528/c8708bb36d70262.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwatipo/haVjis5/kidz_bop_live_tour.pdfIn PDF document text
    • https://site-1171925.mozfiles.com/files/1171925/potaverozolemasoda.pdfIn PDF document text
    • https://site-1244843.mozfiles.com/files/1244843/70646195650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8fcc5d74998.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/tunenijexe/vexagobetuxuba.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/xomilesenunidofobo.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_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 5836 bytes
SHA-256: 0b2cc91e48f1d522576d6f20d19faed265687603a9a730418803d1d4c2290347
font_01_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 10824 bytes
SHA-256: e9592c72e887edc6f0fc1e98e8be13fbc8b07558c554799ed993dad0cb87f0e2

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