Malicious PDF — malware analysis report

Static analysis result for SHA-256 384ee8a513489463…

MALICIOUS

PDF

84.1 KB Created: 2021-04-19 18:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fa391a3f52eeadbe133fe859d2c95837 SHA-1: 74f64cc5b5e4df4a99d434931ae3745162d113fb SHA-256: 384ee8a51348946368738fc1e1f8905c0c31b4d2649fb7c5adae63572905157e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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
  • 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://midufefew.ru/strik?utm_term=american+comparative+literature+association+2021 PDF link annotation
    • https://cdn.sqhk.co/rotonoba/aKHkbwF/nomerapefug.pdfIn PDF document text
    • http://bimoxalobabi.iblogger.org/cofferdams_and_caissons.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/RhgjjOh/vuzorejavowabolapul.pdfIn PDF document text
    • http://dusosax.66ghz.com/47751846503.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuditifu/ibKgi0K/bomberman_game_application.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/gmYighd/kuzinajixonigudofiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vawupemowa/hhgNjiW/chest_simulator_for_cruiser.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/2ihKhgH/download_battle_legion_mass_battler_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/oWjbujc/history_of_cuban_link_chain.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/Xk7n5aZ/favuzogumaziwe.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/88iixgg/cruising_ducks_tag_template.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/cVJjbgj/verizon_free_spam_call_blocker_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/aircrack-_ng_0._9._3_windows.pdfIn PDF document text
    • http://takerowul.epizy.com/73275330771.pdfIn PDF document text
    • http://falumivifovupe.rf.gd/una_definicion_propia_del_aprendizaje_basado_en_proyectos_abp.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/vanitisilasimemelonarulos.pdfIn PDF document text
    • http://sarososibi.rf.gd/13038094088.pdfIn PDF document text
    • http://fererugame.epizy.com/gonijafos.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/dexozarogifadujewod.pdfIn PDF document text
    • http://xofajekebukup.rf.gd/banachek_books.pdfIn PDF document text
    • http://rudemunipa.epizy.com/10493126383.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/aegis_geekvape_mini_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/838427244.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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5452 bytes
SHA-256: 823c625d494f07dd9afc6e8fae41665cd8233941aadccd94f6e09e7aae93836d
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 13016 bytes
SHA-256: 7fce145f64d558a1c07797190fe205852e1f00eb12ea2dd0fd70062af77d6e48
font_02_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15