Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4e0600b04a0887…

MALICIOUS

PDF

66.6 KB Created: 2020-12-04 15:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f5b92194c9f8a67955d0ee8f288ac282 SHA-1: d8f7d5e31f77d7ac2f49a942d6d4837dad0bdb99 SHA-256: 9e4e0600b04a0887b3789b91dba436c283db5df56f7b736b310e369d655d285b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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=dirty+fill+in+the+blank PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fbba592b00c3.pdfIn PDF document text
    • https://bodadesoka.weebly.com/uploads/1/3/4/2/134234706/6fab6e88815d322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f9805b13aafb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_5fb8b29c7a276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5f91523b19063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_5f9a3ebe3d9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_5fa65bb4c764b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5f8a773b4bd95.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/sedanilukigil.pdfIn PDF document text
    • https://bikewodeganesu.weebly.com/uploads/1/3/4/5/134596115/kozelonasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julaxel/8432935346.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/zokotusixexarinum.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/pojanurukodogikura.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/xaxiwujovo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/tibialis_anterior_strengthening_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/sodikeravuma.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/83329077803.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_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 4984 bytes
SHA-256: fa634f60d7d2ad5d07c3dcfd791171e7e402c4a58a8581c01f11f4cb9524c38c
font_01_sfnt_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 10740 bytes
SHA-256: 50cb72e428ea3dd5483479c4b551d4a094c3dd28b987c9c917ebf9a23e519ab6

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