Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b35f308971f1ab…

MALICIOUS

PDF

84.4 KB Created: 2021-03-22 02:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf7c2a6a333dda02cbca63bfa8d8170c SHA-1: 592c5fba470200180af3de2d7f40f6c036809611 SHA-256: 07b35f308971f1ab45b4b3d3569d6afbe8dc7bf742a8dfed7c4b3e1a3563547d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm. One of the primary external URIs, 'https://crophysi.ru/123?utm_term=hd+background+pictures+for+photoshop', is suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crophysi.ru/123?utm_term=hd+background+pictures+for+photoshop
    • http://bagomebefekixob.getenjoyment.net/where_would_you_go_bernadette_cast.pdf
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/xopitiguk.pdf
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/1623115.pdf
    • https://mosezogojufotu.weebly.com/uploads/1/3/0/8/130813841/waxawumufuwof.pdf
    • http://dojijoxekomutax.iblogger.org/assignment_of_real_estate_purchase_and_sale_agreement.pdf
    • http://sebevifa.getenjoyment.net/jutanutomowisav.pdf
    • http://wejutejejuwow.iblogger.org/girlfriends_guide_to_divorce_season_3_recap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d363d1fb-af34-432c-8517-0eba183534a1/can_u_order_starbucks_cups_online.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_3da53ff8d15e4522b14ef81cad077b22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4ad926a7-736c-48f6-a35c-f98197408705/study_quran_review.pdf
    • https://uploads.strikinglycdn.com/files/9d0fadcd-2625-4925-9fa3-32df953ec98e/3371489684.pdf
    • http://kebenubes.onlinewebshop.net/fixed_asset_management.pdf
    • https://uploads.strikinglycdn.com/files/a4ec081f-02a8-4b07-be4f-04fd2685b0e6/wodefitadud.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_3e0225b0d9ae4676acaf06bbb38cb522.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_ce5ed3c3ed514f3abfc81f89d89a73ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37c6583a-dc3f-46d8-9fdf-cd62267abec1/mofesi.pdf
    • https://uploads.strikinglycdn.com/files/ecdb2656-f872-4ed1-b633-ac92d4fd493c/the_battle_of_the_labyrinth_graphic_novel_preview.pdf
    • http://dinilemave.epizy.com/gejigumud.pdf
    • https://uploads.strikinglycdn.com/files/5536f625-1065-4d34-a643-c810085b39c6/1770469005.pdf
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_9f4ac11390ed4432a5b1f44a9225cb82.pdf?index=true
    • http://benamow.myartsonline.com/samsung_galaxy_tab_2_7.0_gt-p3113_case.pdf
    • http://tiruweditivunaw.myartsonline.com/tonight_west_side_story_piano.pdf
    • https://uploads.strikinglycdn.com/files/d4f39389-0487-41e1-a6fa-0677fa38781f/8506357125.pdf
    • http://ranoponadugat.epizy.com/barb_wire_full_movie_480p.pdf
    • https://uploads.strikinglycdn.com/files/991ad2e6-0f6e-4b65-98c3-961a883050c0/will_craftsman_keypad_work_with_liftmaster.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd62.bin
cf60d3ed86c932911ffd413f932eb5e63a081790e6e701ec8a15856af90027e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 5432 bytes
font_01_sfnt_off00010fd1.bin
b2f1a8c27c34cef7b70f10dc0fe87b084ebdcd28a9acad850a78abf5d0d05ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10736 bytes
font_02_sfnt_off0001342d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 4324 bytes

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