Malicious PDF — malware analysis report

Static analysis result for SHA-256 43db5e47a95eaed7…

MALICIOUS

PDF

84.0 KB Created: 2021-05-03 04:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8844d66753fab10f1904e8b0e2670644 SHA-1: 3ca5a0e727604596126baeb702983ed0ad27070b SHA-256: 43db5e47a95eaed7e166421abe9aff27496da2ea45f402089e0dda6a2806cf03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting. This suggests a phishing or scam attempt, likely designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+long+do+i+leave+jolen+bleach+on+for PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406771/normal_602ddede547ec.pdfIn PDF document text
    • https://cdn.sqhk.co/pepigovagove/hhjuhhV/ketumanujukumabesufapafe.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/fobamisuwejevufepuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/eQrLOha/zekobilivifogewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5ff7086cb3954.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/after_volume_2_gratis.pdfIn PDF document text
    • http://lalashoppen.online/how_to_scan_multiple_pages_hp_officejet_pro_8600yaqp0.pdfIn PDF document text
    • http://vovpomnim.ru/mac_os_high_sierra_dmg_download_google_drivelodoe.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/bujdgha/nuclear_warfare_cold_war.pdfIn PDF document text
    • http://ighelpcenter.xyz/dedanerafimuso7z2co.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_601a262663288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a6ae3a53-9c15-4a5d-bc82-01f7cb62d5ff/48391167993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e77592b-f6e2-430a-b75e-096281742ac9/how_do_i_open_microsoft_paint_in_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02236d1f-1d52-4e24-baf5-1c566ffa065c/badajixamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e040e650-3038-4df1-a3ca-60fc615e0a17/what_color_are_evies_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f598ee-ea80-43eb-bf63-d90e63f1a0ac/23605180627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad848c2e-1a39-4df7-8435-1e9cdad1a5db/vocabulary_and_spelling_practice_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ced325c-f0ba-4157-b3fd-6a7146542abc/23341381577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94763b7-d6fa-4b1b-ac84-021f776d1967/soil_mechanics_in_engineering_practice_by_karl_terzaghi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09126d0f-65fd-41ca-91fe-292b8419a179/doll_house_kits.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 5140 bytes
SHA-256: acf7fef82411dc42500006fc3fcebfffe54aeb7af83493720511f4c50ce04ba9
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 11028 bytes
SHA-256: bd9d6a02bc07803eb3e3353400cde6d766c05841baf6da8be2176c9bb779c76f
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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