Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15471e3d433fc87…

MALICIOUS

PDF

41.2 KB Created: 2020-11-05 23:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fbcd00ed247ede937178435b30d9e7f7 SHA-1: 3bd7916b1550797c36b296f5351d89064749c938 SHA-256: e15471e3d433fc8767c4bfc719606ab80efb3fd6e3bfae0ed8f88d0ed2e03546
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO poisoning attempt. One prominent link, 'https://trafftec.ru/123?keyword=fahrenheit+451+part+3+question+answers', is embedded within the document body and is flagged as an external URI. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links points towards a malicious intent to redirect users. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafftec.ru/123?keyword=fahrenheit+451+part+3+question+answers PDF link annotation
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/841199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f87a7787d66f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5f9ccea5da91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f8764d4d23a7.pdfIn PDF document text
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/cd5070c117b7.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/jupadegogu.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/bulolimepol/razetowosaxezibunuxibawa.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/trade_references_form.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/paraview_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/5th_step_aa_big_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/buwatetatabedogepuxikafoz.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/kyle_harrison_cursing_toys.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/affordable_housing_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/nevibepiv.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/lojod.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_off0000557a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x557A 5360 bytes
SHA-256: b71ce4aefb6452efb68ee7abe2007e48eb6d696cc692f1a6297a2b3ad59a50d0
font_01_sfnt_off000067d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 10012 bytes
SHA-256: 6b9ead0e31a18148d63d461bdb8e484802740698ebbdb532a9b5b9fc2fdd2a46
font_02_sfnt_off000089c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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