Malicious PDF — malware analysis report

Static analysis result for SHA-256 49306a6bda1f1e90…

MALICIOUS

PDF

74.5 KB Created: 2020-12-19 19:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ca1b457bb9db24e137b45341d178961a SHA-1: 08a294a01cb539a2b9aabf16062ab52a548bd709 SHA-256: 49306a6bda1f1e901805e2578be98777d33c36cb31418abcb4ce15613d4436af
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious URL on 'trafftec.ru'. Heuristics indicate this is a link farm and a phishing/malicious PDF. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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://trafftec.ru/aws?utm_term=back+number+christmas+song+piano+sheet PDF link annotation
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/zalal.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/kukuwujudagenu.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/2b669.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/poxuwitaxul.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/vizulenepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f976f53c-f490-4d8e-bf1e-277925a48cd7/r_fantasy_football_trade_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5888d02e-3d62-4c19-b60a-3d8d502eeba6/jereruzuzifasuduzodi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/ayatoul_koursiyou_transcription_en_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd0d4f9-0856-41c4-b346-1e7f9d419b7a/69948698566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f09c62c-c718-4955-b2d7-8cf9c6cbbfa7/adapting_early_childhood_curriculum_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dcf488-f6ea-4ae6-841b-74c90726b37e/personification_worksheet_6_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d28b57-b48c-4b84-8623-a8b70fc68256/exercicios_sobre_a_regio_norte_7o_ano.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/alabama_boating_course_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 5568 bytes
SHA-256: fae06e140a7ccbe4f33fcffe52f229c72366bf715f82b78be82b5f6e72c8d375
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10616 bytes
SHA-256: 691534f82fb96f7fecb212d51495b1bcd2f7c3d6d5f968b2428190c09653b072
font_02_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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