Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b0a2c0df9d4378…

MALICIOUS

PDF

79.2 KB Created: 2021-03-06 21:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76d76548511c399bb64b67b4a068bf7 SHA-1: 7a091ecbb42a041fb8ae67ebe31eca0d23629270 SHA-256: 40b0a2c0df9d437832391691972812dba29f05a34b08893ebf071e909490362b
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, appears to be a lure related to an exam study guide, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • 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://jumiwimov.ru/wix?keyword=civics+semester+1+exam+study+guide
    • https://cdn.sqhk.co/sebutarukaw/jO1CjaI/1759796486.pdf
    • https://cdn.sqhk.co/fivufotimad/4QqrjhF/baby_yoda_coloring_book_pages.pdf
    • http://gejejasofubi.mywebcommunity.org/puruvogirijiresuvazis.pdf
    • http://beririka.scienceontheweb.net/99684467391.pdf
    • http://zodatowafe.getenjoyment.net/bivozi.pdf
    • https://cdn.sqhk.co/tobepeliv/Rfrhdjd/lupopurepek.pdf
    • http://juwupexutaval.mywebcommunity.org/how_to_replace_ear_pads_on_beats_studio_2.0.pdf
    • http://xemizawufogutuf.scienceontheweb.net/sewodotudunurefidale.pdf
    • http://zoguponuwuxoli.medianewsonline.com/togabolafepogawel.pdf
    • http://koxivesuvif.mypressonline.com/71290526840.pdf
    • https://cdn.sqhk.co/zamokaxu/hhUxiiL/redcon1_silencer_reviews.pdf
    • http://vitofemegawe.getenjoyment.net/why_wont_my_roku_controller_work.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wefadep/complex_numbers_test.pdf
    • https://s3.amazonaws.com/towutoginadivu/18804637597.pdf
    • https://s3.amazonaws.com/xapijifas/nasasetuden.pdf
    • https://s3.amazonaws.com/wazorixekunafob/nicholas_sparks_books.pdf
    • https://s3.amazonaws.com/nademopor/bachelor_of_arts_in_information_technology_jobs.pdf
    • https://s3.amazonaws.com/tojazudibumogab/nuwadaxaj.pdf
    • https://s3.amazonaws.com/xukirizugukugi/23554996369.pdf
    • https://s3.amazonaws.com/resabomibogodaw/star_wars_encyclopedia_of_starfighters_and_other_vehicles_free.pdf
    • http://sarutufasiko.atwebpages.com/free_vc_andrews_books_online.pdf
    • https://s3.amazonaws.com/zarusegibitumet/sales_opportunity_analysis_template.pdf
    • https://s3.amazonaws.com/sitok/zegizirenugotimixino.pdf
    • https://s3.amazonaws.com/dumupa/potezexeneredapowenorumu.pdf
    • https://s3.amazonaws.com/jepinebawo/nijaxeperep.pdf
    • https://s3.amazonaws.com/rivazixexuguri/adobe_premiere_pro_slideshow_template_free.pdf
    • http://fidegaf.atwebpages.com/gosikubipezubefigupexukop.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_off0000f9d3.bin
00141315a37963d7185070c08e752eff365a08129427de5a9005cb9d76c6f12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 5416 bytes
font_01_sfnt_off00010c35.bin
0847817d5bace8279dba231919ebcbbe4a503d7494ce39b9b9f8b646034a17e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 10240 bytes

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