Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf85e25541b96edb…

MALICIOUS

PDF

60.2 KB Created: 2020-11-18 08:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad1170cd70a33fff41628aba88d913ad SHA-1: 4b9508162711cd3e154f339f9d365f90e12720a5 SHA-256: cf85e25541b96edbb328b867ede5ed13e341f6f8c1784d5e7840250a272de20d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of embedded links, including one pointing to a known malicious redirector at `https://cctraff.ru/strik?utm_term=duo+therm+furnace+parts`. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0` further supports its malicious nature, likely involving phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/strik?utm_term=duo+therm+furnace+parts
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/xiwubewut.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5faa58241103d.pdf
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f8babbb3d37e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wusone/animated_mr_bean_episodes.pdf
    • https://uploads.strikinglycdn.com/files/ac70c366-bec6-401b-8a9b-0c95492c1952/99052490565.pdf
    • https://s3.amazonaws.com/wovigebi/certified_scrum_master_certification_study_material.pdf
    • https://uploads.strikinglycdn.com/files/4748cb88-9125-45c5-8641-5f3f59656365/rapofujonetilaro.pdf
    • https://uploads.strikinglycdn.com/files/8e36c536-d7a6-4643-971d-bdaa67838e11/luritow.pdf
    • https://uploads.strikinglycdn.com/files/9b74f4a2-e737-476d-9bf3-8cf0636c7f9d/lenovo_vhid_device.pdf
    • https://uploads.strikinglycdn.com/files/94b43163-a996-4a90-8b38-ffb4d5a53a19/metaphors_in_romeo_and_juliet_act_1_scene_5.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_off0000ac65.bin
3b50ca8fa9ffc000d21699e91affdd06158acf23589222b443054c2aadc648d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC65 5224 bytes
font_01_sfnt_off0000be02.bin
f3f12ef09b267bc082a4328639d6f54c809740ba2d486f787cf6c8e9c2378a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE02 11836 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.