Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fc5f34357e5fb2…

MALICIOUS

PDF

76.5 KB Created: 2020-11-24 03:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b76e8d77ccf0442fbcfe74a829eb5705 SHA-1: d2781c934d52b3858464cc3d3a60c0ca05077aa4 SHA-256: f0fc5f34357e5fb2df7cf3a3313386ec4e83cc95be7bb87a8b25d2ddc793f6fe
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffi.ru/strik?utm_term=torce+mu%25C3%25B1ecas+de+h%25C3%25A1bito
    • https://bujuwevirovumeg.weebly.com/uploads/1/3/4/2/134235487/886709.pdf
    • https://nirotobilimob.weebly.com/uploads/1/3/4/4/134484477/tajujepusezetexex.pdf
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/52a563b2bb566f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zabejuvijolu/febalamokel.pdf
    • https://uploads.strikinglycdn.com/files/5d6e5456-76c9-43a2-9377-3bc23b6e3a7f/11318490071.pdf
    • https://s3.amazonaws.com/vokeri/zesopi.pdf
    • https://s3.amazonaws.com/lekizopiloref/fesirifo.pdf
    • https://uploads.strikinglycdn.com/files/486272df-858b-444f-9926-cb14ee853704/junaduxafefup.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/words_starting_with_rent.pdf
    • https://uploads.strikinglycdn.com/files/975a14c0-9834-41ca-8d8a-724a5a48d909/tuwiwiwovabazizigidufuman.pdf
    • https://uploads.strikinglycdn.com/files/52ca253b-0e71-4c55-9285-6dc821339499/chatytv_canal_caracol.pdf
    • https://s3.amazonaws.com/vogubivajavofu/68933348062.pdf
    • https://uploads.strikinglycdn.com/files/a143e667-94ba-4686-bb85-782e86b84ddb/partes_de_la_hoja_de_vida.pdf
    • https://uploads.strikinglycdn.com/files/2ab8879b-95a5-4c06-8d7c-ccf72a74a55d/fomugibesemovig.pdf
    • https://s3.amazonaws.com/nupotukig/gnostics_gospels.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_off0000eb62.bin
98a5a4b26a9ba5dd300e69b67abc327ebe92ecba3a547341d27b093e39093871		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 5684 bytes
font_01_sfnt_off0000fdaf.bin
6963762a2703b552c6f110c9924083b504a985552030ddd417b1478205e9b0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 11764 bytes

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