Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce8ea566c29df8a…

MALICIOUS

PDF

67.2 KB Created: 2020-12-25 19:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cf3f9ef8fb34106ef0a0f0bf3cfe5901 SHA-1: dcd9472ca023c327ac56681d9c254b5ad91aeec8 SHA-256: 3ce8ea566c29df8ae7dbc5ebcf2537fe1dd5b4b734aacbb3d6df3438057e0e5b
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, characteristic of a link farm, with one URL pointing to a suspicious domain ('traffnew.ru'). The presence of a 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious content distribution scheme. Although no scripts were explicitly extracted, the ML classifier and heuristics indicate a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=cash+flow+statement+excel+format+direct+method PDF link annotation
    • https://fakuduvedutew.weebly.com/uploads/1/3/4/8/134866980/8c4accec6679c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f87e5899fc61.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/7ccafdf798af7.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/7025432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_5fb50bb37727b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5f9683140e1d3.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/5hbzhjE/pogub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5fbc862c485a1.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/dolipuzetomipo.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/ea5de822-1aac-4420-bdc0-cfab1be59219/10371798766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b301680-aec1-49b8-b238-9b5b90d45f3b/fifa_15_team_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1bcc7c-cc3b-4e0b-87ac-858ebde656bc/9700321896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c931469-a429-474b-8908-7530790b00cb/child_outcome_session_rating_scale.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_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 5328 bytes
SHA-256: faa14db8bea537e43d2c29404fac0d19be7f7e427ff0acbd7adf8a55885ebb32
font_01_sfnt_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 10412 bytes
SHA-256: f645f722812c6305bcd60bbfb9222bac6c5713862c9ac4ea4dcce80253514cfe

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