Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9155a991cef29ab…

MALICIOUS

PDF

90.6 KB Created: 2021-01-12 14:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cafa0cdfd539420ccaf866212b6cd57a SHA-1: 08fd74626ac728b82f8af86eac242d13bcaebe48 SHA-256: a9155a991cef29ab0034120fec06c84e5759963a14227108b79e55a062e4be23
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/wb?keyword=galaxy%20bowling%20alley%20kinston%20nc In PDF document text
    • https://cdn.sqhk.co/kegufamop/XEifzCG/spiral_warrior_ios_release_date.pdfIn PDF document text
    • https://sefokasezasun.weebly.com/uploads/1/3/4/6/134690402/2464391.pdfIn PDF document text
    • https://cdn.sqhk.co/bijowiroma/9geHgdC/truck_simulator_american_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/jietib5/dune_2000_ps1_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/jQQ3icB/90400899700.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/gljggj5/66531408962.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/nuxuladozozelawe.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/rupatojuko/vinaphone_plus_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/acoustic_guitar_songs_music_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/cfop_rubik_s_cube_method.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/define_single_displacement_in_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/jipabu.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/amazon_prime_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/berliner_platz_2_neu_lehrbuch.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_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 5368 bytes
SHA-256: eabf95a26498e9a95855e9a8205c450e4356b1f512a338dfaff28276be6dd833
font_01_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 10844 bytes
SHA-256: ce6350e883466d37fc8869dcc5604b3ea64022a423783fdffe0ca49c09edb4e2

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