Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0747f38c8aff50…

MALICIOUS

PDF

79.4 KB Created: 2021-01-18 09:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7350e5a655ea3c6c5303a509da595a52 SHA-1: 184f80a8db2ef6eaf95743faea84119da1695b92 SHA-256: ca0747f38c8aff50052b44eba87097d1061f6f02c2b35a44872ef5c969b88055
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent link pointing to 'trafffe.ru'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

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
  • 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/123?utm_term=look+to+the+stars PDF link annotation
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/butejujujojuforubuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fbb74a389aa7.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/vuraradaso/anatomy_and_physiology_integumentary_system_worksheet_answers.pdfIn PDF document text
    • http://jigiwema.epizy.com/auto_chess_origin_guide.pdfIn PDF document text
    • http://nopuxawox.epizy.com/aprilaire_humidifier_manual_vs_automatic.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/eye_test_report_mv-_619.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/amscot_near_me_ucf.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/word_whizzle_herbs_answers.pdfIn PDF document text
    • http://jabukejezari.epizy.com/61316301148.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/a_room_of_ones_own_by_virginia_woolf_text.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/697968737.pdfIn PDF document text
    • http://latilofu.rf.gd/numerical_estimation_questions_and_answers.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/nunomilaxumuveku.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/witcher_3_gwent_cards_guide.pdfIn PDF document text
    • http://varepekolati.rf.gd/69551939138.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/kejizeka.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/difference_between_authentication_and_authorization.pdfIn PDF document text
    • http://wiwekire.epizy.com/way_back_home_shaun_song.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_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 4744 bytes
SHA-256: ebd9d399c7a3b237388bcc58d09f7b490438bf442b3c2951ebc9a8529a923141
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 11076 bytes
SHA-256: 56d0cc23586184a584222bcb705f0760202a0c7d1dd8a43aa712858787160216

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