Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc4e54252ed3fba…

MALICIOUS

PDF

83.5 KB Created: 2021-03-13 13:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f83ad3b96564ff0141b8d773f598c0d SHA-1: 1d5a949350e8dfe3b7a56b47690bdd5e07686846 SHA-256: 6fc4e54252ed3fba1bc93fbce2ca5045503f37a25e0f93634e991cf37ba90432
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a payload or redirect the user. The document body, though heavily obfuscated, suggests a lure related to 'biology reference books', combined with a visual download button heuristic, indicating a social engineering tactic to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://lozipotod.ru/award?keyword=biology+reference+books+for+class+12+pdf
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60157cf034058.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/db3051b7a.pdf
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd1b6a16c3e3.pdf
    • https://cdn.sqhk.co/wogefosa/uibjbOP/history_of_ancient_rome_documentary.pdf
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/bebibilepefivug.pdf
    • http://xonanudo.iblogger.org/beats_solo_3_wireless_headphones_satin_silver.pdf
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/majemibigat-garodakine-datesumiga-bisifafaboxe.pdf
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/b8516581b7bf6f8.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/6616663.pdf
    • https://cdn.sqhk.co/fotenulutis/cQlDooU/highway_bike_simulator_highway.pdf
    • https://cdn-cms.f-static.net/uploads/4390052/normal_602f9bccc80f1.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_604c984a228a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://texatopewewew.epizy.com/chessbase_light_free.pdf
    • https://uploads.strikinglycdn.com/files/fe9496d7-72c6-4949-9c66-854fd3ef0d4a/2008_dodge_avenger_starter_relay_diagram.pdf
    • https://s3.amazonaws.com/jiwisi/592586214.pdf
    • https://uploads.strikinglycdn.com/files/2beaee15-937f-4572-ba75-f916c133ab5b/how_the_grinch_stole_christmas_1966_where_to_watch.pdf
    • https://s3.amazonaws.com/buganabowumujef/kahoot_answer_hack_android.pdf
    • https://uploads.strikinglycdn.com/files/3ed048e8-0fbf-4498-9ea4-6334ffa34219/danitererepajekolanasubur.pdf
    • http://xulitapaxi.rf.gd/acer_t232hlabmjjz_opinioni.pdf
    • https://uploads.strikinglycdn.com/files/40db5083-156c-4aa8-aa1d-a19ec4881623/29194150920.pdf
    • https://s3.amazonaws.com/zonebon/eliza_collins_wall_street_journal_instagram.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/biochemistry_by_u._satyanarayana.pdf
    • https://s3.amazonaws.com/fifuto/relodig.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_off000104f1.bin
4434de6ea76a8433f54058374c865a54023df9be3efd4b5085aa37df5352a70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 5864 bytes
font_01_sfnt_off0001190b.bin
925a543ceceb10916981e6a0d4b6f04dc846539ba054b3935816103958b0ae1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 11092 bytes

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