Malicious PDF — malware analysis report

Static analysis result for SHA-256 239c7403a5ac2e43…

MALICIOUS

PDF

83.8 KB Created: 2021-04-09 18:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7bd86ec37c2e1f1e692748200886881 SHA-1: dbe9076fe04c1398ad4fbb2c01ed89431be2274e SHA-256: 239c7403a5ac2e4370f69fd50467124a36acc494a3229a9e1397ce9b48be39e1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on external services, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://resalured.ru/strik?utm_term=wilton+dora+the+explorer+cake+pan+instructions', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://resalured.ru/strik?utm_term=wilton+dora+the+explorer+cake+pan+instructions
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/nivogikejuretozun.pdf
    • http://xowimixipivup.22web.org/16888467951.pdf
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/6170965.pdf
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/5110858.pdf
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/6d31b76125.pdf
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/redirusadanobumuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35e4f746-7c67-434e-81a1-590fbbc9e64f/bonunuzevatede.pdf
    • https://s3.amazonaws.com/paxunu/denidirofakavitaf.pdf
    • https://s3.amazonaws.com/sigobija/how_much_is_a_first_edition_harry_potter_and_the_half_blood_prince_worth.pdf
    • https://uploads.strikinglycdn.com/files/3fb9d255-e199-4762-9bab-b258f042b70b/it_essentials_final_exam_answers_chapter_10-14.pdf
    • https://uploads.strikinglycdn.com/files/ccbe348b-9ffa-4826-be1c-23f2a1204e44/62999677922.pdf
    • http://fugijinamum.epizy.com/3_theories_of_language_acquisition.pdf
    • https://s3.amazonaws.com/rovikibixu/game_soul_blade_apk_data_mod.pdf
    • https://uploads.strikinglycdn.com/files/941ebdb0-b90a-4a0b-b357-ff88e5708434/foxokifigulikikuzedater.pdf
    • https://s3.amazonaws.com/nowokil/2019_online_games_android.pdf
    • https://uploads.strikinglycdn.com/files/a982a375-abd6-44cc-9203-ddb144546c54/lowest_calorie_taco_bell_menu_items.pdf
    • https://uploads.strikinglycdn.com/files/ca91c96f-b246-417e-aefe-be354371539b/weather_and_climate_worksheets_grade_3.pdf
    • http://jiresigotapikeb.rf.gd/basic_computer_troubleshooting_steps.pdf
    • https://uploads.strikinglycdn.com/files/21d12372-8bfb-4d9c-a6d9-f6ca95cb919e/8174702969.pdf
    • https://s3.amazonaws.com/gajakelegeza/honda_cb_shine_sp_image.pdf
    • https://uploads.strikinglycdn.com/files/d01cc836-8c66-4a95-9386-c40cc260686e/evenflo_symphony_car_seat_cleaning.pdf
    • https://uploads.strikinglycdn.com/files/29a6497d-1253-4296-80e3-bc0e0f125b76/fizagefawerezivu.pdf
    • https://uploads.strikinglycdn.com/files/18357fce-e791-4c5d-b94f-63a1f94df596/what_brands_of_chips_are_gluten_free.pdf
    • https://uploads.strikinglycdn.com/files/30acb3aa-9c62-44c5-a488-83df5e70ecd2/38187616334.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_off00010600.bin
2178b6e7b5e5e1ddc3e0dba1046f5e16910a8c34a85a1c138c536d77ad679967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 5308 bytes
font_01_sfnt_off00011810.bin
5924614927a3b652077880f193a88feedf59393ba2ac20f3d3090a143814dd19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 11568 bytes

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