Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9d40860b609ee1…

MALICIOUS

PDF

75.4 KB Created: 2021-04-16 11:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0b268b6815a87fb37809034b6fca0f8d SHA-1: cfe7b681934d33ef6997e28f1c7792895d41fb18 SHA-256: 1e9d40860b609ee15d8c3664e1bd7b0143580f2185f5f3fd9bb0aaeab6b185cb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure itself is also flagged for suspicious object handling.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=36+questions+natalie+cook+lyrics PDF link annotation
    • http://xajoxirutojik.iblogger.org/complex_numbers_worksheets.pdfIn PDF document text
    • http://odemebayisitrafik.com/my_little_pony_birthday_cake_singaporecvp3l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_604ef1120e385.pdfIn PDF document text
    • https://cdn.sqhk.co/nenutipu/ggdjihh/kavadox.pdfIn PDF document text
    • http://datujizid.iblogger.org/40853307713.pdfIn PDF document text
    • http://kawibijew.22web.org/some_applications_of_trigonometry_class_10.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/97c98079649f94f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fdc5f034b7b4.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/8850057.pdfIn PDF document text
    • http://lovelyhouse.online/types_of_cnc_cutting_tools74w6o.pdfIn PDF document text
    • https://donixefafara.weebly.com/uploads/1/3/4/3/134310569/biwigaverijijupegu.pdfIn PDF document text
    • https://dorigobumin.weebly.com/uploads/1/3/1/3/131384291/lomet_fawutidufur_wujomawolanabe_dejifowe.pdfIn PDF document text
    • http://reduslim-sito.site/wiwifezotapijutususijudk94v.pdfIn PDF document text
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/tupizudega.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/hgtWojj/live_call_voice_changer_app_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenirugelalef.rf.gd/how_to_create_comic_book.pdfIn PDF document text
    • http://zusotofamagukam.rf.gd/how_to_have_a_good_relationship_with_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a44f8ce-1a7b-42a6-a940-4d51bb324bf1/jisidusewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3292a75-29a5-47f2-9b1d-f37c827e9b53/how_do_i_reset_my_ge_adora_front_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014f380b-2347-4648-9f16-6032077b056b/electrical_installation_symbols_for_drawings.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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5308 bytes
SHA-256: 842c8c55a51a8e0021ce37f5d4842ad25307ecbc858cbf90a3d85638fe4a5b2f
font_01_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 10856 bytes
SHA-256: 834b5a8f0db458cc4dc7df9102353b7b9d17409097d9a282f61c24ff145c59ed

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