Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74fb34f598ecac5…

MALICIOUS

PDF

76.5 KB Created: 2020-12-18 18:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 665d0f7acf4516bc1b8e7cdee641d201 SHA-1: 1789dc6fd23d3cc972ef5d42ab9bb0a3ca0a8810 SHA-256: f74fb34f598ecac5068ed773176ae6e7c0016b718dde16460bf1fdc79c661fac
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external URLs, including suspicious ones like 'https://traffset.ru/strik?utm_term=martin+jaguar+recurve+bow+string+length'. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=martin+jaguar+recurve+bow+string+length
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/7703809.pdf
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fd89b319fc26.pdf
    • https://jurugifako.weebly.com/uploads/1/3/4/8/134869201/1c2b0b4855c710.pdf
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fc70cd7c1534.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f8ad4d238926.pdf
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/sujuwuzede_loxiwa.pdf
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5fc5c6eae51ee.pdf
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/5ede03609aaae.pdf
    • https://cdn-cms.f-static.net/uploads/4466391/normal_5fd8280028988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/55fb558b-dc7c-496d-b78f-7ffa786c04e5/topobegubesejowesobol.pdf
    • https://uploads.strikinglycdn.com/files/54bd41db-aa28-400d-b08d-b5b9940c79f7/70482220905.pdf
    • https://static1.squarespace.com/static/5fc5d95bbdb33045eee4110e/t/5fd18069133bcb3b88955331/1607565418652/35636516160.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd24c8382300306c2e6ff5/1606231240740/23663937416.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd4.bin
a7d5ed76db41338aaea44797c67ce3be1593b3aead7681145838b4e9b944f13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5316 bytes
font_01_sfnt_off0000f1f7.bin
4892d310d6d49815d17a42045fcf902086ac915ac2cd51167854997297ba89e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10924 bytes
font_02_sfnt_off00011744.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 4324 bytes

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