Malicious PDF — malware analysis report

Static analysis result for SHA-256 07833241e201c43e…

MALICIOUS

PDF

71.4 KB Created: 2020-12-17 13:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5fbd502a065c45857811b91d15735c43 SHA-1: 5f69907c03a6d0c493a7fcf733f3ba6637ff4a92 SHA-256: 07833241e201c43eb1648af4bec548f39208f6850a01db8443eb395ee2d98c1b
156 Risk Score

Malware Insights

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

This PDF file, identified as malicious by ClamAV and an ML classifier, contains numerous external links, with a primary URL pointing to 'trafffe.ru'. The document body, though heavily obfuscated, suggests a lure related to 'experiments controls and variables worksheet'. The presence of multiple external links, including a link farm heuristic, indicates a phishing or redirection attempt to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffe.ru/strik?utm_term=experiments+controls+and+variables+worksheet PDF link annotation
    • https://retinagarar.weebly.com/uploads/1/3/4/3/134319249/gafarub_xivok_xaferudiluvu_wujuwusepozokip.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/d87845d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5fc3673ce82a6.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/gejon.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/9fb293fb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f9e53fb7c205.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/pujuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7aba6778af068263fedd7/t/5fd6025a034a586a4f394c10/1607860831332/20331160293.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/witchery_mod_vampire_or_werewolf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdea3b5d43e676cbd1e847/t/5fcf5a880ff3944fc558c245/1607424648806/63808782100.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc328402e537a05ef17c917/t/5fcdad1605ddc9599d3f7d58/1607314711562/jam_crossword_clue_8_letters.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10b921452f90b7fe62c2d/t/5fc5339c4e98326c02b9eb1e/1606759324416/19371647339.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 5696 bytes
SHA-256: 7154f388bfa1e849b486b1bc9b0d389037e5b11b13588ceba4ac018909c7b616
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 3956 bytes
SHA-256: 6a8f458a2fcbad3ea7d2236d8f7d61c7c18818aa46a24943486482b8d3c252e3
font_02_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 10668 bytes
SHA-256: 41de3b88edf56a4ed199cbde7bf45997f82c9bd1ffd0d9166d641e6e87e319b7

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