Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4e2d357a51a5e7…

MALICIOUS

PDF

66.5 KB Created: 2021-03-20 17:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac72d8e69c768b4da4e2b27fb05e05a3 SHA-1: 891b02338f67e975864ba7d8640f0fb5a2fa0673 SHA-256: 6e4e2d357a51a5e7412144c128c48e1a73c6d122e19b5c9b965e035a4c8ef03c
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 as a link farm, with the primary suspicious URL being https://jacksth.ru/award?keyword=the+slave+girl+buchi+emecheta+pdf+download. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=the+slave+girl+buchi+emecheta+pdf+download
    • https://static.s123-cdn-static.com/uploads/4475577/normal_60090698c1563.pdf
    • https://cdn-cms.f-static.net/uploads/4493876/normal_600a888f9aad5.pdf
    • https://cdn-cms.f-static.net/uploads/4374839/normal_601976ec0858b.pdf
    • https://cdn-cms.f-static.net/uploads/4449973/normal_602d0cce1d829.pdf
    • https://cdn-cms.f-static.net/uploads/4406463/normal_60357977d8c6b.pdf
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6033f741bfb93.pdf
    • https://cdn-cms.f-static.net/uploads/4467564/normal_605026a216417.pdf
    • http://sanelobazigi.medianewsonline.com/catalogo_ikea_2020_espaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/degisapemifa/small_tree_of_life_tattoo_designs.pdf
    • http://zogadawedalifap.onlinewebshop.net/nanifelegubimavopafimewug.pdf
    • http://tipokeviti.atwebpages.com/poxuxon.pdf
    • https://s3.amazonaws.com/jivuxo/94905913724.pdf
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_f133b9172cf046b8a5a25cd6e977e806.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/enterobacter_vs_coliform.pdf
    • https://s3.amazonaws.com/wibedubosateg/duvikikukepebekudewonal.pdf
    • https://s3.amazonaws.com/papuja/south_movie_video_mp4.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_c6b3fbbecd2e45de99b51d6f61c4dec5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c499.bin
2a123d5c2fcd3a5c2ef83cd647a5865e5e35b12bb04fed429d9fc6439c324f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 5812 bytes
font_01_sfnt_off0000d847.bin
6321271723e4b1afe46de5643be54f1b3b61b42baa59238bc4648202d1f9b905		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 10372 bytes

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