Malicious PDF — malware analysis report

Static analysis result for SHA-256 b852a012c229ed61…

MALICIOUS

PDF

77.1 KB Created: 2021-03-13 22:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84b82d0be9d9adf7d37ec3d9b917cc6f SHA-1: dc55dde98db134f1697a0345746f72b14f8ba1ee SHA-256: b852a012c229ed61bf64f3c7e2837b4c7f3258325e11a4814f19b4310873ff7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many of which are disguised as book download links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_URI heuristic further support the attack pattern of redirecting users to potentially malicious external sites.

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://zajinet.ru/strik?utm_term=modern+indian+political+thought+book+pdf+in+hindi
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5fdf3bdbaad23.pdf
    • https://cdn.sqhk.co/vowibesep/fhagfjj/werewolf_the_apocalypse_tribe_novels.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_6027f309b28b6.pdf
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/wadepevofawakag.pdf
    • https://cdn.sqhk.co/piwewupovo/gia4Ihg/tigozafozesosed.pdf
    • http://ttop-shop.com/67539332027g65h1.pdf
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/3105664.pdf
    • https://cdn.sqhk.co/duwefetufe/aYjbjfJ/zatorepij.pdf
    • https://cdn.sqhk.co/busibelifiv/PihRwie/88789001208.pdf
    • http://popularchoice.space/55356404800q3234.pdf
    • https://cdn.sqhk.co/rapovebakeb/4GQhd32/wunibizidapezutugoxisi.pdf
    • https://vuguwawu.weebly.com/uploads/1/3/0/7/130776175/16b34.pdf
    • https://cdn-cms.f-static.net/uploads/4425211/normal_5fe8497ea2832.pdf
    • http://iminn.ru/junji_ito_collection_manga_order9rdts.pdf
    • https://cdn.sqhk.co/gefimiwotux/shj23b6/best_train_simulator_games_for_pc_download.pdf
    • https://cdn-cms.f-static.net/uploads/4450426/normal_603117e8a932a.pdf
    • https://cdn.sqhk.co/zalopubid/iOEjjdy/mavezivarasevusavuje.pdf
    • https://cdn-cms.f-static.net/uploads/4406787/normal_6036650dea047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7d927ce7-3bb2-4edc-a01a-13ad917587dd/68039135509.pdf
    • https://uploads.strikinglycdn.com/files/07462df0-31c2-4019-917c-bc85d70f4cd7/american_standard_ac_blinking_red_light.pdf
    • https://uploads.strikinglycdn.com/files/ad767bf2-cbb2-4f4d-8dc3-208f7c391d19/medical_terminology_a_living_language_3rd_edition.pdf
    • https://uploads.strikinglycdn.com/files/9fd9437c-e84a-400d-9e65-735a0593a2dd/black_max_6560_generator_carburetor.pdf
    • https://uploads.strikinglycdn.com/files/c8f0dac4-dd7d-40d3-b31b-fb9f8dcd20bb/how_to_get_a_helicopter_in_gta_v_cheat_codes.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_off0000e762.bin
866308a557be28ae934e805b3ed56b5a66bd84dc8a7dcb2b4aa38df3bfe081a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5448 bytes
font_01_sfnt_off0000f9f2.bin
6656bac2309cb926b11dfd71d3a9d34833f31930076f71f2c58946f1d743bec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 13712 bytes

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