Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe410980d47097bf…

MALICIOUS

PDF

78.4 KB Created: 2021-05-10 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 363554ed32a54088a80782cf28990699 SHA-1: 52f4f8f3ed12a2362b3012f2b6ee29a19e8d536a SHA-256: fe410980d47097bfe6ab6558d0a0e95ec3a90aa6309fa9bdd6b9ab5e19f13936
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=romeo+and+juliet+characters+first+and+last+names PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381738/normal_60657e50c2240.pdfIn PDF document text
    • https://xiwikufebalub.weebly.com/uploads/1/3/1/4/131438050/63d9a755c12.pdfIn PDF document text
    • https://mavusuwavonim.weebly.com/uploads/1/3/4/4/134493404/zosakowetasidenan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_603f22c5cb723.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/gifofoterimavokusor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_606c3cbb47d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6046cdd7bffe2.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/580f5fcf-665f-4f54-abb4-55f0f1dc5916/40071870783.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_fa1cc54da2604971a53b41c980fb4178.pdf?index=trueIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_8d7a37f285e544b597a2b92d8263fdf1.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_c4ec5d2cf10d4fb9b28c8ab7116e2bc8.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_59452989eb454ee7b824f6f11c1948ca.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_dce1a5a64b0e4b6ba1c0756451d01f5a.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_a16ed1ad6b584cb39eaae1efda9f37d0.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_8e931791368848ef86d141cf642b55b6.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_065525b579944f99ab9a591f749fab25.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_b3682f3233034cdda315427713d5d3a0.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_e9cb34d8811444a4ac3cae7ab60362fe.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_1a769489adc647b8b2f5a4d2650ce977.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_5636034af0eb41abbf6d5aa239b178a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4356ac-db50-43cc-9ff5-024ec4db889c/what_are_the_rules_dating.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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5344 bytes
SHA-256: bac6ac4994ace37c07da2a8ee1433fcc564a8b7e756c145761b6d90c32f0228c
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 11716 bytes
SHA-256: 934eab249325b8c94c05fa82b3acf9e247434e8462ed66f068ed13df87559180

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