Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c8e93318be527f…

MALICIOUS

PDF

81.4 KB Created: 2021-03-23 22:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a04bbd88cff8fe286f4aea0a4ac4248c SHA-1: d7cb985f86f3b32b48a02b6ab7c97a2cc9e2f386 SHA-256: c5c8e93318be527f28e12e3f04bf4ff31be72fa48cd4b0e3db102856bbe3754b
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL disguised as a search result for a study guide. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URL likely leads to the download of a malicious payload, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=chemistry+subject+test+study+guide+pdf
    • http://dowator.22web.org/37582142932.pdf
    • https://cdn.sqhk.co/tatidukigag/jacb6jh/mirtazapine_for_sleep_dosage.pdf
    • https://cdn.sqhk.co/pugirunosamo/fhb8Aij/wurubedinabosegugixar.pdf
    • https://cdn.sqhk.co/nuzinipaz/jggIifN/31846274584.pdf
    • http://morasufas.iblogger.org/collectible_doll_value_guide.pdf
    • https://cdn.sqhk.co/zobelekivix/hbKhjAH/farm_heroes_saga_free_download_for_android.pdf
    • https://cdn.sqhk.co/bopelara/KgeLJii/chocolate_cupcake_recipes_without_vanilla_extract.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokafanawa/degree_of_data_abstraction_in_dbms.pdf
    • https://uploads.strikinglycdn.com/files/7e28af98-af03-4729-813c-59877a811698/51557503426.pdf
    • http://begalokatixatu.epizy.com/wimapedutamekogut.pdf
    • https://s3.amazonaws.com/napoledunadigo/blood_group_o_negative_diet_chart.pdf
    • http://nunitew.rf.gd/87596217065.pdf
    • https://s3.amazonaws.com/pisedij/will_there_be_a_new_hunger_games_book.pdf
    • https://s3.amazonaws.com/tinivukedeta/25540743729.pdf
    • https://s3.amazonaws.com/xesigeze/95564740913.pdf
    • http://zefexulipovi.rf.gd/anniyan_tamil_full_movie_free.pdf
    • https://s3.amazonaws.com/rejiner/razixosonefaxur.pdf
    • http://pivukezafubajeg.rf.gd/2nd_world_war_in_tamil.pdf
    • https://s3.amazonaws.com/nunakixuma/64102891405.pdf
    • https://s3.amazonaws.com/dalava/knight_age_online_item_guide.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/sosozamawekivupuwig.pdf
    • https://uploads.strikinglycdn.com/files/ff1db39e-930a-47cd-9161-07d20a127247/63924630631.pdf
    • https://s3.amazonaws.com/tozaduliwubega/59916005786.pdf
    • http://bidexegope.epizy.com/fufadosepuxekefafuvejitu.pdf
    • http://kotidaw.epizy.com/alone_together_full.pdf
    • https://uploads.strikinglycdn.com/files/d8f1a623-2955-4b02-903d-77746f81371c/bobabonowulexorosilole.pdf
    • http://jilabof.epizy.com/58547629602.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_off00010092.bin
615d0ff83ba518fc837a1fd3b098ca150b4f04a5dbf4419d286f4ad725873b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 5548 bytes
font_01_sfnt_off00011350.bin
042b6f14c5c7a43a8a7c040cd69c30b14a1f6f725b5c46c29534ad43850a4206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 10724 bytes

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