Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d10afd4ad8cb34…

MALICIOUS

PDF

88.2 KB Created: 2021-06-10 14:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 819fabb2d5f969cb0ccd38997ef64049 SHA-1: ae9cbb2436a6badb69451cd068879e46f7119e3a SHA-256: d4d10afd4ad8cb343c40168f98119713242c8c9a51218d6a34d92b3fe9ea410d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a link farm designed for SEO manipulation or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medvor.ru/pbw?utm_term=simple+certificate+design PDF link annotation
    • https://lonirukigosoz.weebly.com/uploads/1/3/5/9/135965403/4062700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_60004af89da15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_601cffd230af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fd86103c3ee1.pdfIn PDF document text
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/nibug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_60362628bde03.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/3060278.pdfIn PDF document text
    • https://potezevaledu.weebly.com/uploads/1/3/1/4/131406960/6cb8f7276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_605d79ec142c1.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/366e2d7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamotekegopa.pbworks.com/f/how_long_does_ogilvie_home_perm_last.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144566877/35301360529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9939d37-e67a-47d4-b702-5e4733fb5552/choose_your_own_adventure_online_short_story.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144723057/how_to_end_a_program_script.pdfIn PDF document text
    • http://wukexav.pbworks.com/w/file/fetch/144839970/shiv_tandav_stotram_in_hindi_download.pdfIn PDF document text
    • http://sisiwovad.pbworks.com/w/file/fetch/144787926/repavo.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/144483681/ps3_oyunlar_full_tek_link_indir.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/18366618209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ceb97b7-7c6f-41bc-bff1-9d7ced45597c/novimizopen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab04bc46-bb8d-4856-ae0f-8f428e152f45/31765428172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01454a58-c33e-416b-87a3-a77f3f55135c/the_drummer_boy_of_shiloh_test_answers.pdfIn PDF document text
    • http://tujolim.pbworks.com/w/file/fetch/144759450/sejalapipa.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144526770/59719655418.pdfIn PDF document text
    • http://lifabukis.pbworks.com/f/newogegesezo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 5580 bytes
SHA-256: 1536fbd05325d940b04a3122c21cc9236f472060d76c8589b662ab6a07049d72
font_01_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 11592 bytes
SHA-256: 59fb28f413e1ef383be723276388996e16354237dd27ad219385c965668d8c2f
font_02_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940