Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c99e28da69cdc3f…

MALICIOUS

PDF

69.0 KB Created: 2020-12-28 16:38:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 747d83c762d9f5625620e208fa33d0b5 SHA-1: c8c3da2c7515b6d5eed6bdaaaf0f3a49ea04450c SHA-256: 6c99e28da69cdc3ff7f353a134494dd1bf02455fa6c29893e88999b470e528e9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The PDF_SEO_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the PDF is designed to redirect users to potentially malicious sites, likely as part of a phishing campaign.

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 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.
  • 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://trafffe.ru/123?utm_term=mega+man+x2+trophy+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5fa84dc515a39.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/eghggji/chicken_invaders_5_full_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lodabazul/phhgdif/play_slap_kings_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5fcc906979823.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/Djgijd5/rarest_pokemon_cards_per_set.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/shhjgzJ/duledirafananabevobavige.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/dokunuwifetodo.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/geQiahe/kumir.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/2ojb7ic/tiny_kingdom_builder_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_5f98495c9a67c.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/dakebesuvum/zajawijojopig.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/asus_file_manager_apk_latest.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_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 5352 bytes
SHA-256: 5ac35a2ed5ff096ad65898603fc3846cb7bfbdf59d570038be945e4792235243
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 10344 bytes
SHA-256: 63b96c974d10257991e5f38805de40dc9db8aec64641ff653a824bf1cb05612f
font_02_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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