Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfd1d706d489d6f…

MALICIOUS

PDF

115.6 KB Created: 2021-03-25 00:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7257a2d3bf74d3bade27ab7b1605f894 SHA-1: a68181d9c044833aef927c0953039973beba0ade SHA-256: edfd1d706d489d6fd3321ac8213c656341332340be7a80996df2231a3a032195
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers indicate malicious content, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to car servicing costs, intended to drive users to the linked site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+much+to+service+a+mini+cooper
    • https://cdn-cms.f-static.net/uploads/4416501/normal_6024306123138.pdf
    • http://bitunowaluf.sportsontheweb.net/catalina_perez_correa.pdf
    • http://negedibomul.sportsontheweb.net/funurivogifuluvuzase.pdf
    • https://cdn.sqhk.co/vefemenivu/hrjbngG/nimewiv.pdf
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/33532d.pdf
    • https://cdn.sqhk.co/wepurodapike/jimRhgb/idle_mafia_tycoon_manager_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/moturalogupe/bhhBmtv/minneapolis_bus_rush_hour.pdf
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcb99b7eda6b.pdf
    • https://cdn.sqhk.co/tuminageka/dHL5AIy/80s_music_playlist_spotify.pdf
    • http://lelekelosutov.getenjoyment.net/18643735.pdf
    • https://cdn.sqhk.co/nizekidido/dhjxghf/archer_season_11_episode_3_release_date.pdf
    • http://dagefose.22web.org/kamirizug.pdf
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5ffbc841c75fb.pdf
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/4559061.pdf
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/1327f92625f06.pdf
    • http://vumajufeboxidik.mywebcommunity.org/82874254203.pdf
    • https://cdn.sqhk.co/ketusugedi/Dfja0gd/85270518437.pdf
    • https://cdn.sqhk.co/biwizalibe/fzihkJ3/telecharger_traffic_run_uptodown.pdf
    • https://cdn.sqhk.co/bulunazi/V5Kibgd/nedopawavomegemaludup.pdf
    • https://static.s123-cdn-static.com/uploads/4426967/normal_60083c7012976.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_602d2acbaf203.pdf
    • https://cdn.sqhk.co/zovaratigu/e3idi08/saw_master_drill_machine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wilixafex.epizy.com/nizugiwukagepukora.pdf
    • http://mafokesa.onlinewebshop.net/ejemplo_de_brief_creativo.pdf
    • http://liruvumud.rf.gd/disjunctive_syllogism_examples.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_off0001861f.bin
92374559aba74f960225418d1350e2f04261a3721ee68face16b03cebdb684dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1861F 5252 bytes
font_01_sfnt_off000197eb.bin
f1cefcdcb6513611c3f046d2f169dc5ca2be5a0496bd21779cd93ae910b39954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197EB 12120 bytes

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