Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b2afc1bd9fb37e…

MALICIOUS

PDF

83.1 KB Created: 2021-03-31 17:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fdedf7541cd2bcbb0ae224f5eb1faaee SHA-1: c90e686670f86a0b02519e9a4773c4491aa96a9e SHA-256: 34b2afc1bd9fb37ed29e7517b0a9e41bd61787148c7f3d9278f7f51dac2f873b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary malicious URL identified is zajinet.ru, which is presented in the document body as a manual, a common lure.

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://zajinet.ru/wix?keyword=milex+-+power+pressure+xl+pressure+cooker+manual PDF link annotation
    • http://tryadasert.online/problemas_educativos_en_estados_unidos1oeml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6048c53f1e504.pdfIn PDF document text
    • http://dorightpress.com/cracking_the_communication_codehudpw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5fee9d922de41.pdfIn PDF document text
    • http://1green.space/95528715669yldgs.pdfIn PDF document text
    • http://apeech.ru/14246594794j4tps.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/rjbhciF/girl_kicking_soccer_ball_gif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_600226c3391fb.pdfIn PDF document text
    • http://copyright-help-report.com/36051492584250gr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_60503e7e79395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020f91b01be1.pdfIn PDF document text
    • http://pixell.store/cub_cadet_lt1045_specsdpyrq.pdfIn PDF document text
    • http://supportcopyright.net/hp_officejet_7510_ink_cartridge6e47j.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/dkPhdja/bipezobuzotegoju.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://s3.amazonaws.com/widetunipet/sorting_algorithms_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a3fd98-f246-4a7f-a4d1-81aef8157102/fender_frontman_212r_footswitch_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e152ef09-2fd3-4033-912c-f9a8b45a43f2/tcp_ip_reference_model_vs_osi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48ad2b9-5826-47c2-b3b5-82e0ceab497c/22704572727.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/craftsman_edger_3.5_hp_blade.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/10_class_science_solution.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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5140 bytes
SHA-256: ba875140ed3be0fe1a3f653c08290b8f5eb81363db139f172474d1f6999f1cb9
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 11496 bytes
SHA-256: 6bf8f6437817786ecd1a47b8e2bdd3a79a1dfa1704085c28f48939c7850a65c2
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333