Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c2185f29e5a2e4…

MALICIOUS

PDF

70.5 KB Created: 2020-12-09 06:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb0dc0f5b174fc70de574c600a513675 SHA-1: e89c9a80b664ff111e7effcaacab1f0bcb460c67 SHA-256: 39c2185f29e5a2e4617d15e7e4f691e5759558cb462b2de11d46d1fbf647b93f
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one prominent URL being `https://trafffi.ru/strik?utm_term=excretory+system+worksheet+pdf`. This URL, combined with the heuristic `PDF_SEO_DISPOSABLE_LINK_FARM`, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafffi.ru/strik?utm_term=excretory+system+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5fab6b65cb557.pdf
    • https://cdn-cms.f-static.net/uploads/4454164/normal_5fa3b26668df3.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f885c2c8e3be.pdf
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/jujepalisiro-gadederefutona.pdf
    • https://cdn-cms.f-static.net/uploads/4487935/normal_5fbd4aed408d4.pdf
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/fitigi_sajitog_marojewomeko.pdf
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/4177594e574.pdf
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/1633915.pdf
    • https://tevigopodasipa.weebly.com/uploads/1/3/4/6/134678542/devajorumov_bufip_xoduboveleka.pdf
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f87b8fa746f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/risalenefazozo/difference_between_cal_king_and_king_sheets.pdf
    • https://uploads.strikinglycdn.com/files/057cbfc2-6530-4c7f-8ca3-1a2b62ef3a7d/digimon_d_tectors.pdf
    • https://s3.amazonaws.com/mubefula/56921748160.pdf
    • https://uploads.strikinglycdn.com/files/aee8a5ec-4e70-49bc-9201-116cdb2f0ff1/78203669279.pdf
    • https://uploads.strikinglycdn.com/files/ced4f110-119e-40b9-9944-03401c2c21ec/nyssma_manual_online_free.pdf
    • https://s3.amazonaws.com/zodawanuror/ti_84_calculator_download_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/591d2ee3-068f-41ea-a336-0b574b2ef259/wizitegi.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_off0000d567.bin
e7eaf92d0524c83c22d1a79f3b62080ac77b1a9b9bf72da936e22e60c2ef73a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 5436 bytes
font_01_sfnt_off0000e7e3.bin
4d4d8d3cae9f00344099bf30ad873926e307fd23295a89964fb7c71e6907e458		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 10816 bytes

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