Malicious PDF — malware analysis report

Static analysis result for SHA-256 f015be7e02b5721b…

MALICIOUS

PDF

73.8 KB Created: 2020-11-26 04:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ca8861d2123eac2295ac32a60ab69b SHA-1: d0926377af2ef0bbcf4d8b569fea3f09ab04e740 SHA-256: f015be7e02b5721b277c2a913e5f2246001f166d423d09bc122cb4fec6f215a5
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 as a "PDF link farm", and one of these links points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffking.ru/strik?utm_term=gibbs+cycle+reflective+essay
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fb40837e06b4.pdf
    • https://pudibodug.weebly.com/uploads/1/3/4/4/134464821/8254c2d7f8f2f.pdf
    • https://tepidopuk.weebly.com/uploads/1/3/4/6/134698813/315bd15d65d0fc.pdf
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5fb6698d46fc4.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f9897889f0f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vikukinumet/43584534881.pdf
    • https://s3.amazonaws.com/jumedemimo/gujivujes.pdf
    • https://uploads.strikinglycdn.com/files/4e126027-96db-4a98-abee-8e6a7bb80a96/how_to_ddos_a_gmod_server.pdf
    • https://s3.amazonaws.com/xefejevife/55256981759.pdf
    • https://s3.amazonaws.com/regufojalojaza/cccti_transcript_request_form.pdf
    • https://uploads.strikinglycdn.com/files/38c716ca-0eb6-4d4d-b55b-16020f553d55/51676157874.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_off0000e421.bin
d7cf7b51cbbdb2363ecef4abf9f49de0857ad42b0943342cb439abaf09066ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 5208 bytes
font_01_sfnt_off0000f5f8.bin
4dbfe0de35693aa338add820d86160868823de91afbc4b8dfb6d7736029776b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 10700 bytes

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