Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54a0c99edb0f3f2…

MALICIOUS

PDF

85.8 KB Created: 2020-12-17 01:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1dea9e33d8402dc00d22f961317303a SHA-1: e73fdb9583ccfe485a2be6e9900e754d17b1db86 SHA-256: c54a0c99edb0f3f28bd9c2206668e2ae0cbabe60f370b2c89ec93ad7629d7691
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'traffine.ru', suggesting it's part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the true destination or spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffine.ru/strik?utm_term=knowledge+management+case+study
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/9087219.pdf
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5faa77044d294.pdf
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fb012d88a01a.pdf
    • https://bidudazup.weebly.com/uploads/1/3/4/7/134744853/909e0fa2d5812.pdf
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/fopizitimuni-gufena.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/tulesajipuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5fab0e818ae75.pdf
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f9dd334359c0.pdf
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5f9d8ebaee2dd.pdf
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5fad20febc420.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/9119141.pdf
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/mubaporuniki.pdf
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/nonawe-vasukiwuxebaba-sodoriwizaripu-saxiwumem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5af41a3bf4b14abc9db24/t/5fc7f455bd4f1f2025260f77/1606939733684/71714635790.pdf
    • https://static1.squarespace.com/static/5fc5756a6609fd0ee7b04842/t/5fc8f19e0b207364bc539373/1607004575508/fugubibisitunorabab.pdf
    • 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_off00011271.bin
58fc887446326873d95e335bc60e29ae52775e3c58446e3fc0282a97256d3193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 5324 bytes
font_01_sfnt_off0001249a.bin
97cf284c3d9aa8f6cb1208d68cf0751fb4580b9b8637fab9aefd31e12f8ab40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 11004 bytes

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