Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b1d4dc17107390…

MALICIOUS

PDF

66.2 KB Created: 2021-03-23 05:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd57e3ea550c243ef4d5e2fdb1025a57 SHA-1: e7b5e94c9e305a580514a4dde87950774c48c040 SHA-256: 74b1d4dc171073908d2913823eef4a13f19538738df905293fe141686a402b60
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as academic or informational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=tesis+de+calidad+de+vida+en+adolescentes+pdf
    • https://cdn-cms.f-static.net/uploads/4422382/normal_60343d1c2cac7.pdf
    • http://beririka.scienceontheweb.net/the_hobbit_concept_art_book.pdf
    • http://dalifajebuxog.scienceontheweb.net/rujeseru.pdf
    • http://jixazepo.mywebcommunity.org/brighton_and_hove_school_holidays.pdf
    • https://cdn-cms.f-static.net/uploads/4490370/normal_6048d6c34b0e7.pdf
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5ffec4ca5dcf0.pdf
    • http://zijaditenup.getenjoyment.net/msm_photodetector.pdf
    • http://lebedugipul.mywebcommunity.org/juxesuzuludezegofixuvoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4479462/normal_603dd4dea5bd1.pdf
    • https://cdn-cms.f-static.net/uploads/4461744/normal_6053836278a66.pdf
    • http://gegebafebofad.scienceontheweb.net/44165671692.pdf
    • https://cdn-cms.f-static.net/uploads/4372377/normal_60303176032f4.pdf
    • https://cdn-cms.f-static.net/uploads/4450419/normal_602126e58000b.pdf
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5ff4b65437330.pdf
    • https://cdn-cms.f-static.net/uploads/4443354/normal_604d67713df00.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_520a8c1b639c4bfab2698ab00252a6e1.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_f045231e16fc4471abd5794aaaf91711.pdf?index=true
    • https://s3.amazonaws.com/xujitezu/18203360064.pdf
    • https://s3.amazonaws.com/rurovikejigibu/68140201625.pdf
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_b7808a77883049e6bc82580fec44c1b3.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_e86e4de3b7b648a19818bf8840beb141.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_off0000c566.bin
577acbb2d3f57e9ddca8df86a23ebaf24b8e6eac090d95ce410e34aac6673e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 5064 bytes
font_01_sfnt_off0000d6bf.bin
cbf9942696cc9c9f79411cd6a84d13086b87d98ed50386891fb9793195ead957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10528 bytes

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