Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dac1a74db9e3eb0…

MALICIOUS

PDF

73.7 KB Created: 2021-02-07 13:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31a26653f2d8559ceda361f8d7893887 SHA-1: 8650eec4ded368999a6746a60564870204bef92d SHA-256: 1dac1a74db9e3eb0bdc9cc27c5eba234c5521aebac872318edb8d688a23386b6
154 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, yafferge.ru, which is disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wb?keyword=fly%20fishing%20guide%20annual%20salary In PDF document text
    • http://rawenspant.online/instructions_for_making_cement_cloth_plantersrdr63.pdfIn PDF document text
    • http://rabota-plus.club/la_carreta6u5ux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_6015bd6525d61.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/RiRjcjd/22597397911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477408/normal_6006d0f843896.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/Zjjhjzn/fugek.pdfIn PDF document text
    • http://copyrighthelpptteam.com/matrix_organizational_structure_pros_and_cons4p3w5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fca67f033f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fe6a0c5b54a3.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/XichjqK/papibukokagenefibomiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5fd9c94fe0656.pdfIn PDF document text
    • http://marketeuro.pro/46810978554qhlmn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ffb4b5a2cc45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fff15081343a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fca8ddd00dd2.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/iYSgdhh/bluestacks_among_us_mac_safe.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/jedobufudajewu/db_browser_for_sqlite_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/xupanefikiduta.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/zisewovopakasaxem.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/cow_dung_biogas_plant_design.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/bike_race_mod_apk_android_1.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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 5224 bytes
SHA-256: fdd6638b74768fe111642ec076e9f00bff11038baf15c32ea69b8710ada573c1
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10312 bytes
SHA-256: 358ce3f126146cdc110b8337657fcb0446b3e51fcb3b6b02c5a4bdbdd9c88df8

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