Malicious PDF — malware analysis report

Static analysis result for SHA-256 659506a838cb24fb…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 15:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dccef8fbf63eeb566e1a9fad1180ee0a SHA-1: 1c6d083fc5419237442ddb347effbda631574dd3 SHA-256: 659506a838cb24fb0ad85a2e9a73b33b0d08eb25d71f73117b212b61a07016b7
136 Risk Score

Malware Insights

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

The file is a PDF document that contains a lure related to 'Blue irises for sale' and embeds multiple URLs. One of these URLs, https://jacksth.ru/strik?utm_term=blue+irises+for+sale, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the ML classification suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=blue+irises+for+sale
    • http://confirmationhelpcenter.com/5158738780327i8.pdf
    • http://alexsaf.ru/curl_of_gradient_of_vector_functione7geo.pdf
    • https://cdn.sqhk.co/tovipovo/e4TMJTi/71124838846.pdf
    • http://uscarinsurance.info/today_sandesh_newspaper_vadodarapzm3i.pdf
    • http://vezokikawelin.iblogger.org/54192881331.pdf
    • https://cdn.sqhk.co/zimuteraf/jiNjfhb/42055911213.pdf
    • http://bigowet.xyz/136547907720jktd.pdf
    • https://cdn.sqhk.co/xagunetoxa/hi6Lnhg/online_multiplayer_shooting_games_unblocked.pdf
    • https://cdn.sqhk.co/vixuwegijelo/hehbin3/sniper_1993_movie_trailer.pdf
    • https://cdn.sqhk.co/mevexobuzur/Usghjhd/17374582178.pdf
    • http://7evenrp.ru/hoover_whole_house_elite_manuallc1f4.pdf
    • http://nosetibadap.iblogger.org/fovekajiziram.pdf
    • https://cdn.sqhk.co/nebuwaxisiw/iiBgghh/5668270219.pdf
    • http://rixiroremijiw.22web.org/4867728396.pdf
    • https://cdn.sqhk.co/fexiseme/ifgjMij/best_looter_shooter_pc_games.pdf
    • https://cdn.sqhk.co/kafexobesa/xjffidk/bang_bang_song_video_tinyjuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nawezurik.rf.gd/think_central_science_fusion_grade_7.pdf
    • https://s3.amazonaws.com/kovilowab/kawasaki_ninja_400_service_manual.pdf
    • https://s3.amazonaws.com/bupaxomu/78278650683.pdf
    • https://s3.amazonaws.com/firigugixujotov/65116187720.pdf
    • https://s3.amazonaws.com/salosibejodod/members_mark_pellet_smoker_grill_parts.pdf
    • https://s3.amazonaws.com/mejawiwomak/zetukanivukogeko.pdf
    • https://s3.amazonaws.com/vovopafubipu/6624671349.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_off0000f919.bin
0cf3a81ab3b07491bdf96f370e90263d79262cd4750775782e7f7b3904f42cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 4808 bytes
font_01_sfnt_off0001097b.bin
6fa828623b868a9d41e45027971498cc4981ae0adeafa200ff2d0eb1d72b4352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 11652 bytes

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