Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e5a2ab427b16f8…

MALICIOUS

PDF

64.7 KB Created: 2020-11-26 07:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65ae7fd40afc98c697fbc2193bd532b SHA-1: 6f955ec73eda02d72b39f296be98ee4af4297ca0 SHA-256: a7e5a2ab427b16f8ce09b958b6a7561198b6cec525e1fa988af920abeb8d2378
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which point to other PDFs, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is part of a campaign to redirect users to malicious sites.

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://trafftec.ru/strik?utm_term=essential+kanji+pdf+download
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8d620a19667.pdf
    • https://tibanevugite.weebly.com/uploads/1/3/4/6/134655495/5304868.pdf
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/becbbc95b4fcdd.pdf
    • https://nozesebekujizaj.weebly.com/uploads/1/3/4/6/134698307/rulubimunufumu-ganovev.pdf
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fa101c4c1428.pdf
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f9771c417605.pdf
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5f9ed30e7f1dd.pdf
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f9b5991005d0.pdf
    • https://ribijiwazafi.weebly.com/uploads/1/3/4/8/134881841/letojimozikowopiwaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/272900d8-ac9b-4e44-977e-364ad9f89b5a/enfp_socionics_vs_mbti.pdf
    • https://uploads.strikinglycdn.com/files/32de9908-ed05-41dd-82ff-9dd3a6e70853/rizivadutilavebiko.pdf
    • https://uploads.strikinglycdn.com/files/5229ccc3-59ab-47cb-8811-e2af9d6a7d7a/wipuxokikiroxal.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_off0000c320.bin
79201dfa3eb4931512a19e3c9dd179123d7b1d2b30aee9cf3287c33c4172a12b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 5128 bytes
font_01_sfnt_off0000d4c1.bin
1999e3c8b82b622a38e9ea2e65256df367b6176aaf2e93368679ed5fbc157001
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 9940 bytes