Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fae80319f38c5b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 00:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9834a59405d196c8b2f2df4416aea625 SHA-1: 9e4e5d1bb8e5e34c894f148d094462e94932b9f0 SHA-256: 31fae80319f38c5b300b9be90d18192f071c86dbc8b81a866e8a69ba2a3ebc94
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The primary URL found, https://ponafet.ru/award?keyword=advertising+and+brand+management+pdf+free+download, further indicates a lure for free downloads, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 6

  • 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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=advertising+and+brand+management+pdf+free+download
    • https://xuwawimo.weebly.com/uploads/1/3/0/7/130739806/kamupinaxiw_wizizan_dosexe_balajilobod.pdf
    • https://cdn.sqhk.co/putizimetiwe/iiaiCWQ/fekenivepizerukorimodi.pdf
    • https://cdn-cms.f-static.net/uploads/4390052/normal_6031df08a85dc.pdf
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/xuvigadeli.pdf
    • https://cdn.sqhk.co/bivuwusim/idt5haW/xerazevozopelukipidumif.pdf
    • http://kopuvimu.scienceontheweb.net/the_body_electric_yoga_facebook.pdf
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fe5057d1fc19.pdf
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/xijewe-jitunitipeku-donumub.pdf
    • http://terugate.mypressonline.com/what_does_los_amo_a_ambos_mean.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_602b35f4dc6c4.pdf
    • http://memowelubi.mygamesonline.org/78212535781.pdf
    • https://cdn-cms.f-static.net/uploads/4463002/normal_602a8baf5f326.pdf
    • http://gifipagi.22web.org/bed_sheet_washing_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_2314018d74c6498e8b9d28ba492c2919.pdf?index=true
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_82efffea65ce41b6893ecb4fe3de973e.pdf?index=true
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_56cb145fdd3e409e919f623299510376.pdf?index=true
    • http://vizokipinebawik.rf.gd/funny_journal_prompts_for_adults.pdf
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_12f2c7dfb8d54da49795f9cf511ac4de.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_962321d196be4ed789e24a41be7e2e75.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f894.bin
4548693729b0f51c828c06f3475f53e720695d464fa9c9a668d3c7d07a4a2cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 5644 bytes
font_01_sfnt_off00010bc4.bin
e4f1ea07f77d4d43e08e4b3bf0d4cc29ffd0bdc8866385ad6ddd04f6ab52615d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10912 bytes

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