Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69e6ee1a3732c88…

MALICIOUS

PDF

74.1 KB Created: 2021-02-16 08:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c92e7fc1f6d8c2bcb01f6b0991732ea1 SHA-1: 99d4d8d07a2f60bb96e81cea23a409169d7b3e8a SHA-256: c69e6ee1a3732c888af4ca3287e1cc8b2865e15f5813440f9080d67b27d0973e
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a redirector link to 'yafferge.ru'. ML classification and ClamAV also strongly indicate malicious intent. The embedded URL is the primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=the+natural+movie+quotes+two+lives In PDF document text
    • https://cdn.sqhk.co/fowijuseziju/jjlgiCk/22319612628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_6027c8c52d512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_6011643f0d9ac.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/fyhbha1/95955928436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5ff4c5b5a6932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_602408c22573a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fddbaec4e027.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/xidodevilubaz-wexafa-zuwolux-jibab.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/fKgjGhi/chris_harris_jr_chargers_contract.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_5ff711ad227ba.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/jaminimikubemuxutodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimoxorud.epizy.com/heads_of_agreement_document_template.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/jitudosupifumamag.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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 5152 bytes
SHA-256: bd8ae4ff495c701337faa2e2424b8528d1d42b1aef033dc5e847b4421c624e05
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10828 bytes
SHA-256: 481a29c0ab744d582a0c10ef00183e0fc687b8f7a7b5a0253e7c6b3cd8591e24