Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28f82c08e8d6f8d…

MALICIOUS

PDF

69.5 KB Created: 2021-01-08 17:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05dc8bec971b228660c4967fd1545612 SHA-1: 53fcaa6f24831cd3a9c38c9c0b4f6cc9925fc86a SHA-256: c28f82c08e8d6f8dc1ac4f9cb2a4563e946f1bbb1df305e44f3ae4aece4e1604
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/aws?utm_term=wow+druid+owl+flight+form PDF link annotation
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/giboxeroxiranoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fa66cafd7312.pdfIn PDF document text
    • https://sukurexu.weebly.com/uploads/1/3/0/9/130969838/piwem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5fab07d28554c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5fb4a2e42be44.pdfIn PDF document text
    • https://cdn.sqhk.co/milimewaj/hgiivjb/gangster_speed_hero_robot_fighting_games_unblocked.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/gokuwapa.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/54e6164b-9939-4713-804b-e2d5e1833b8c/jironilawozenibedevol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c7ede2-757a-4765-ba57-fd9b8d7f58a9/91025368738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913b3951-0fad-4be0-a8f9-eb297287c0d4/nezik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c6b972-ee0a-407c-af85-ac8e1bbd2e7d/letter_to_contractor_to_finish_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790fe239-3ca1-4bb2-bbda-645f44f9df26/american_furniture_direct_outlet.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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 5040 bytes
SHA-256: 636b3eb504184c2371a9bfa2493b684bd07f9f4bd20656a4a08f84c49bef1fd5
font_01_sfnt_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 10532 bytes
SHA-256: be828ceb19b035c8cc65c58917127c04d02d0519e669f65f69afce5304301f93

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