Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e5c9809149c256…

MALICIOUS

PDF

84.6 KB Created: 2021-01-06 12:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a5414e534cf0effdaa456cbafbae8a SHA-1: db4e7bc0aac5bb46e0a7c2e437ed5240f1df1f1f SHA-256: a1e5c9809149c2565b2043d3f7a728cc6bd5ad19503a2185d4fd96e3d70db921
156 Risk Score

Malware Insights

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

The PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to an 'instruction manual for apple ipad 4', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=instruction+manual+for+apple+ipad+4
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/buxidor_bumopiwix_wujikawiri.pdf
    • https://cdn.sqhk.co/zusegekum/Hjbjbhe/vesodipe.pdf
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5fe8a3908f1e2.pdf
    • https://cdn.sqhk.co/zirimikuj/JifJFgh/my_movies_anywhere_activate.pdf
    • https://cdn.sqhk.co/faresawuf/gLji0lZ/soccer_field_3d_model_3ds_max.pdf
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/wapaxuwapod_jomapoj_teradizovobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/093520a3-be8e-41d8-9174-c4f8a4945300/pavote.pdf
    • https://s3.amazonaws.com/bizamesuwepe/sawevapigugosemegaga.pdf
    • https://s3.amazonaws.com/vixuwogetiv/hungarian_rhapsody_piano_duet_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/c3bc937e-7bfe-41a9-96f9-caf19312100e/petejob.pdf
    • https://uploads.strikinglycdn.com/files/ac9213c0-ce66-42aa-be5a-3b95db21624a/taronuvinogiroxuzibe.pdf
    • https://uploads.strikinglycdn.com/files/ec7313b9-5db0-4b5f-9d1e-a042082c1bcd/yer_adlar_ile_ilgili_efsaneler.pdf
    • https://uploads.strikinglycdn.com/files/fa01b0d1-5180-4bbb-a79a-66cba0bed5a8/vadebudumebavasusititu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca9.bin
e33cf4719bf9f891b7be4213f29080834838ad23df16ffc0bed039c525953169
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 5328 bytes
font_01_sfnt_off00011eb3.bin
40d87a6cc174804a965507d6613103f7b604a47684d7ba943539945de578441b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 11320 bytes