Malicious PDF — malware analysis report

Static analysis result for SHA-256 f429bd58f489c803…

MALICIOUS

PDF

82.4 KB Created: 2021-01-08 17:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d3761b4fe6d770a43f09d9fe101179dd SHA-1: 95dadacc3a125b7824c83f6d11540007a3b17e2b SHA-256: f429bd58f489c80390f7d7fbb415fc668d2b1b4955d42f477c032bf5423424c8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One of the primary links directs to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/aws?utm_term=veinte+a%25C3%25B1os+despu%25C3%25A9s+alejandro+dumas+pdf In PDF document text
    • https://cdn.sqhk.co/movijomo/aiagchg/59377436482.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/wgigdjh/mars_mars_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_5fae9df51a5c6.pdfIn PDF document text
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/mulavuli.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/zhfigji/arknights_tier_list_creator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488322/normal_5ff425f832830.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/Y0jbRge/fenugolurevire.pdfIn PDF document text
    • https://voligamaxe.weebly.com/uploads/1/3/4/5/134512074/6883479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71adb6c1-9b07-4df6-81bd-cd7cd44e7a0e/money_possessions_and_eternity_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3a99bc-9823-4f24-ae17-000bdee0f0e6/bofomibamine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7ebe5c-9a68-41fc-8bbe-21504efa9907/princess_dress_up_games_capy.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_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 5580 bytes
SHA-256: 9739ccc80dec15f11cf62c10712ee7f979e397f2664e02231365ce832b7a062a
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 11816 bytes
SHA-256: 50f43473530f6fb446d5a27347d471063d9433c0bcd0552c7d172c02e0ec9f0b

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