Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4df98db3185259…

MALICIOUS

PDF

76.3 KB Created: 2021-02-16 20:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 86d0f6895f894ac9f0be4f2465b44b27 SHA-1: 03c615b7f824ec14773ccf9eeaa7110fe14942ce SHA-256: cc4df98db318525935222230b295e4730c8dfd6dbe1186f7abd29f2945480677
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social-engineering lure to trick users into installing browser-related software, a common method for malware delivery. The embedded URL points to a domain that appears to be part of a link farm, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/wix?keyword=microsoft+edge+chromium+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5fdbeccaba819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fd906c05f250.pdfIn PDF document text
    • http://nextauto02.ru/what_is_the_neo_personality_inventory_used_fora5iei.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_60029515ce20b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450256/normal_6002a0c6005aa.pdfIn PDF document text
    • http://italysummer.space/balveer_natak_ringtone21p6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_6004786187699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fe651e5af024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_602af7033b17d.pdfIn PDF document text
    • http://vamoktin.ru/62807980710bitgd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481418/normal_5fefa23b41e15.pdfIn PDF document text
    • http://verifybadgesbusiness.com/cabotage_act0nl4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_6014bc191ae2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fe9b605428d3.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://s3.amazonaws.com/zagubip/31367328905.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/772354103.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/95616413718.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5488 bytes
SHA-256: 16b20e150d92bbb78c68cdf2a4c4723600e7d225fb9759c1e270c134d144a3f0
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10424 bytes
SHA-256: e2aa8fe2d09d7f61f5fd2f0b55cd882d367c72d36c19874b8bd4d09c7e5c2454
font_02_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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