Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c5e676f2d6ce85…

MALICIOUS

PDF

145.5 KB Created: 2021-03-20 19:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 894ed1cfce0be40a752e4a7aced556db SHA-1: d75e10f2ba80a1b1402ea14fe87eed1756aa615d SHA-256: 86c5e676f2d6ce85b23096596ca7da2d67d47cf907cb4e91c213369b6a20ac6a
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically identified as dafemum.ru. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely designed to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=3d+custom+girl+evolution+mods In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_6002670e34b7c.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/Mjdiiy2/need_for_speed_rivals_songs_list.pdfIn PDF document text
    • http://eurostore.info/conversation_english_apprddgi.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/encephalite_nmda.pdfIn PDF document text
    • http://lipenav.mypressonline.com/awards_and_honours_2020_download_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/jdigigw/tiwogufade.pdfIn PDF document text
    • http://teatr-art.com/maze_runner_movie_download_in_hindi_filmywap6rs44.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/fjgdgjF/like_father_like_son_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_603f6acc290c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_604b2578dc3ce.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/gulawarabidajali.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/bismu_jet_bula.pdfIn PDF document text
    • http://armada.technology/josodigaw1zo.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/blender_2._7_game_engine_tutorial.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/what_are_the_five_characteristics_of_computer.pdfIn PDF document text
    • http://dontbeshy.xyz/dungeons_and_dragons_3.5_npc_generatorpzc1j.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/pavekunakof.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/eJhcgdY/inotia_4_plus_difference.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/ii5gjnX/avanceon_limited_annual_report_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00020f34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20F34 23304 bytes
SHA-256: 2e826eef0ec9033330715629a3c2780a665e35958ac3f6113d8a8035bbfb5ba2
font_00_sfnt_off0001d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D470 5180 bytes
SHA-256: 4ab71b94856f46bba117e13cdd12d435c199c4724234f1a62e1a19581a769c0c
font_01_sfnt_off0001e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5F9 12044 bytes
SHA-256: 2acaf1253ddc6145eea1c524a0716070591ecfd175165c336a8976a7147d17f8