Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43700aed8c522c1…

MALICIOUS

PDF

73.7 KB Created: 2021-02-26 14:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64ff29e4fedb3b794fcf3306ae4e5c56 SHA-1: 2f898c3189ad8cf8142067b1fa3d3bfac9bcbccd SHA-256: d43700aed8c522c15e75f8a2a93cb63ec8cd2e4d20488b91f91f9fa2b24562b2
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'Attack on Titan' to entice users to click on the malicious link. The presence of numerous external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=attack+on+titan+full+movie+part+2+end+of+the+world
    • https://cdn-cms.f-static.net/uploads/4443812/normal_60386ca477622.pdf
    • http://tefitagesev.mypressonline.com/35553200018.pdf
    • http://abzac.me/adventure_island_game_for_windows_8w2bbj.pdf
    • http://xuzerujagojagip.scienceontheweb.net/15071749347.pdf
    • http://gapagal.mywebcommunity.org/sm-t350_lcd_screen_replacement.pdf
    • http://dosijefa.mypressonline.com/best_shows_on_epix_2020.pdf
    • http://matcobzor.ru/52184759936vjpro.pdf
    • http://mizebojusur.mypressonline.com/gunixuketonelaxasuxanobuk.pdf
    • http://bbcua.site/wefiwigubizore3t2o3.pdf
    • http://mavigawika.scienceontheweb.net/cuales_son_los_sintomas_de_embarazo_de_gemelos.pdf
    • http://lebizifijafaxim.medianewsonline.com/96158113867.pdf
    • http://xilexevu.scienceontheweb.net/what_can_kill_a_wild_boar.pdf
    • http://gun.eco
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajixe/sevadofifikufovokek.pdf
    • http://zudupaxub.myartsonline.com/babazona.pdf
    • http://piwakitidi.onlinewebshop.net/is_there_going_to_be_a_sequel_to_american_assassin.pdf
    • https://s3.amazonaws.com/toliwudalamem/smurf_life_apk_free.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/asphalt_8_hack_version_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e348.bin
00e2cb48a7269e43c0d984f053c5d7d860d09ec172f94e1fbead2bd55f759b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 5552 bytes
font_01_sfnt_off0000f61f.bin
50b25ac9eeccbaa68d8468ff3a4936b989162608b72731c1a1ef1e4d45bd2785		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10328 bytes

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