Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc55485a88d8335…

MALICIOUS

PDF

70.4 KB Created: 2021-03-30 23:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c957c6cad038e06d0b979d5c2334c9c SHA-1: d42db910cd0de5165c3df1274c8fcfd3a59adfc0 SHA-256: 7fc55485a88d8335e0bf0bf6ea2110e2c9193eda387e1b6d90bae25fde1d6086
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic indicates it's a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, by presenting a lure for 'wallpaper' downloads. No scripts were extracted, but the presence of external URIs indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://nipisod.ru/123?utm_term=b+name+hd+wallpaper PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407747/normal_600918c74d55d.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/kant_critique_of_practical_reason_cambridge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5fc97d5f506fa.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/ti_sao_file_b_li_font.pdfIn PDF document text
    • http://zevuzigix.iblogger.org/how_to_put_starbucks_barista_on_resume.pdfIn PDF document text
    • http://mubalupuzapo.22web.org/nebagizanolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_604143d0618fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449001/normal_5ff9efae45b17.pdfIn PDF document text
    • http://zupeset.22web.org/biwofedipesukugixaji.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/mckeachies_teaching_tips_ebook.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/30526343733.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/jyznjig/knight_rider_2008_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuzorumuji/ijAx69g/34804850940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_6016c53736f1d.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/acceptance_prayer_aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60393b371a641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5ff06aea7ce54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakatikik.epizy.com/lufuvuvikibebanezupug.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/what_should_i_do_after_medical_assistant.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/21135176547.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/benim_hocam_video_ders_notlari.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/craftsman_42cc_2-cycle_16-in_gas_chainsaw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/53242960338.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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 5164 bytes
SHA-256: dbfd65c75b6670719a59cbe3d0cffd7bfb927ec04a2a230af662b2522d4f7fea
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 10800 bytes
SHA-256: b7f8ae40b423d219c3b7527531955ee09a42c9b20a0ea818af7c5f4dc71c8d76

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