Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c45a33aa6f8157…

MALICIOUS

PDF

76.0 KB Created: 2020-11-19 21:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 096363bb92419ee7127325888d580e70 SHA-1: 79bf28ea1274d4012baa0d3508d61a86995a3c4b SHA-256: 42c45a33aa6f8157fa1ba73367a82e7eedc10b42d15de16c3e0cbc2184540dbd
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. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/123?utm_term=pump+paintball+guns In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_5fb38df247348.pdfIn PDF document text
    • https://juwimifabofif.weebly.com/uploads/1/3/4/3/134369341/ferinedak-gukurukeledono-gisanawitaj.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/duretazejoso.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/zekiwexetoteb-boxiraxe.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/2430949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_5fa172dc7e877.pdfIn PDF document text
    • https://buminezavo.weebly.com/uploads/1/3/4/6/134650892/ribub-sutowekewu.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/rotazojegisuv_bujova_runanukule_pamizixizepip.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/4918862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f8f77546d2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5fae274db0377.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/rogugagatuf/whirlpool_quiet_partner_iii_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/empower_big_lots_ess.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/wovobelixap.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/83073862622.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/wavemaster_punching_bag_red.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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5184 bytes
SHA-256: 329135f1d279353d99f0ede655f8cef8c3e2492222c0e02e14ab676a7269e9dc
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 10680 bytes
SHA-256: de94060f4ce2d49320b2bf2e4a057db2c6d1b49aa054f42d71b4267eb37354cc

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