Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdd5f4b5f19fce9…

MALICIOUS

PDF

98.6 KB Created: 2021-03-21 01:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd91fbc40e35afe74817e4831066f79a SHA-1: 5ecb0f36f511716ec5338249d3a6512bc6d4b7d3 SHA-256: 7cdd5f4b5f19fce937b8fa8ac0c22d45882c487c4db50214d6794fcf2285097c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://fokemale.ru/wix?keyword=perks+of+being+a+wallflower+movie+questions PDF link annotation
    • https://cdn.sqhk.co/digiwejasipu/AgegcWw/3633752842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_60053742ac71f.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/0vibTgd/6952183650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_603153e3c2d50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ff28feedaa1b.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/bescherelle_conjugaison_anglais.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jfjjYhh/pokemon_tcg_online_iphone_x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_603552643231e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_60052731d4c60.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/bams_college_code_in_maharashtra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_6000ca6eb9a4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f27ad12f-7025-4096-abaa-559a87d78e9b/physics_kinematics_problems_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d39e27b-b877-4422-9d94-101f1d344380/nuzoromikag.pdfIn PDF document text
    • http://pezamax.myartsonline.com/tonarexamenuxojidarox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec7f385-7e56-41c7-bb2d-8b1f6e898f1b/5214181815.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/vuguwofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a01668-c2fb-48dc-91a5-910b2dc18c8c/fenuzulasefupulav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 5452 bytes
SHA-256: 05e78b1b14e03d4c4c1b6cf2cdcb9bfbfb9d84cc639195b29ff6216bf5b8510e
font_01_sfnt_off00014943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 11164 bytes
SHA-256: 67a365db7f06d82759309ab21ba29e81b8b2d4164bfc4679237ccbfef19a381e
font_02_sfnt_off00016f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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