Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49b28c457713663…

MALICIOUS

PDF

66.5 KB Created: 2020-11-13 09:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0f979791d8d85cac4c3bb54714851c61 SHA-1: 65e7e7538497ee6eaf1561b26398f25292756820 SHA-256: b49b28c457713663f5ea011811d6caf1bcb2be8daa880b7f15d49b5d9592b0ba
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous external PDF links, including one pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=fl+studio+12+register+key+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491969/normal_5fad67e77af3d.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/6775254.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/d1026b58-62ee-4d9c-a31c-8565cf26059a/praxis_5354_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ad3ec6-813e-4830-99fa-ed6b21ef8670/just_a_closer_walk_with_thee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bca702e-821a-4b2e-920e-6d5e5245d23c/35085376396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a01fe3d-8c4c-4b5e-b07d-f0524dfd50ff/powanetaxawedase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70717d9c-162e-4c04-bd6b-13ccc5fb2db7/66458738288.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/kizujapadaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/what_are_some_action_words_that_start_with_n.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2dbc46c-f4ea-474f-bdb0-f3bd34f077e7/22657882214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eab4063-e128-459a-91f5-e1b712600fb4/75705037970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d10d87-6385-4751-8036-4dfee0364607/94423876782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43f1a8d-bd99-4dd3-b737-3f82e41dfbf1/xokizidize.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_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 5388 bytes
SHA-256: 2340261cb95c7ebf7435f8b1518509fdf86b17145f6ef38988f2f916ece51948
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 10976 bytes
SHA-256: 8108d8bbc8d7ab9c789868b2be0567f7ce9246d8bed8573ece9d347148670f92

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