Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff35982bbaf29d8b…

MALICIOUS

PDF

62.7 KB Created: 2020-12-31 21:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e88b030c0cb7b7c9616cde24d46c9ca SHA-1: 76401b468c7e61f3ee1701874e0a9c06099da1c3 SHA-256: ff35982bbaf29d8bd5336e65d757e2b158fdc867938169df39cc165ed01c3574
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/123?utm_term=what+words+that+start+with+ly In PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/79b195f4060a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_5fbe5f846c6af.pdfIn PDF document text
    • https://dojeviwenos.weebly.com/uploads/1/3/4/4/134491393/2a205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_5fbd3e969c459.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/hgricFd/drifting_games_online_multiplayer.pdfIn PDF document text
    • https://munizifazu.weebly.com/uploads/1/3/4/3/134354015/9c4880e1f0edd00.pdfIn PDF document text
    • https://wifonofiwi.weebly.com/uploads/1/3/4/6/134636358/bukekegenuxasoboxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/tigotutivuxirevos.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/meaning_of_absolute_advantage.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/sodidubedabegejopumube.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/violin_and_viola_duets_sheet_music.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_off0000b820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 5120 bytes
SHA-256: 2f092f42fdded90fe86d8f48f20b2c66565ad49ebd1e1f1011e96a2f18715c81
font_01_sfnt_off0000c99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 10268 bytes
SHA-256: 177bc03bfa3ad65cd7c37ea33184f150ce17d4d3a513fd6c0d5693e2b2a65c4f

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