Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bc6b7c0cf19ee8…

MALICIOUS

PDF

118.5 KB Created: 2021-01-05 08:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 33b12dc08c0cc08775037a5301c7d5ff SHA-1: 87c96c18ac60dfa62b6a99bb339803090e88ade3 SHA-256: e9bc6b7c0cf19ee835f1435776c63d88c709282cf27954300e0031c722631f60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=water+normal+map+shader PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424007/normal_5ff3c9c420539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5f8d6fc904324.pdfIn PDF document text
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/fesaguduw_jezamedojifupo_puragelo_lewajap.pdfIn PDF document text
    • https://cdn.sqhk.co/zupisopad/h4hghd3/fnaf_skins_for_minecraft_pocket_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5fa2c3faa6a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fd2f91b21204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fe3a630766a8.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/ajf5i4Y/froggy_bounce_house_fountain_valley.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fb28e47ccadb.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/b5aaf07b-7a74-44db-a170-3d55828daca9/bejaludujegaradibovod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56fd137-37a2-4f1a-b77f-a65335527073/zaxukozegulakapoxofarob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff9087-2164-4448-a033-bb8ea01c7265/laziwuduwagalufetila.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_off000194d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D2 5212 bytes
SHA-256: 95fad692946ad0ebf13764ccfaa218cb833cfe30ea96085f79dc8e2d10b15cce
font_01_sfnt_off0001a665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A665 11368 bytes
SHA-256: 5ff80016637889224f1dbf623c430bbd5cae430c570f1c7f2793645184cd91d3

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