Malicious PDF — malware analysis report

Static analysis result for SHA-256 36db830251985717…

MALICIOUS

PDF

78.6 KB Created: 2021-03-11 12:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 14554d52bc52580b1b5152c1980b7269 SHA-1: 18d9a7b9eba2d118251c8e659c2fd5daa4fc9f41 SHA-256: 36db830251985717c7aba88aecb9aca29854da6838b55838e5dc1f3fba06c5de
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a site related to 'tomb of annihilation pdf full'. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The structure suggests an attempt to drive traffic to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/award?keyword=tomb+of+annihilation+pdf+full PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449392/normal_60055209dfeaa.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/eELjiji/cute_things_to_do_list_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/ajh8jjy/play_pubg_make_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5fcd24783dce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_60383ba693e13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5ff983661fdd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5ff0ee48b1e2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1660744-2ec4-467e-9cbc-c0a0c5b3ec42/is_william_afton_a_real_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977626b7-f963-4c9e-82f5-78f0e4fa514b/how_to_reset_a_motorola_e6.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/brother_printer_dcp-_j100_installer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e568f7-bde4-42d1-abc0-5003c0cae3b5/car_air_conditioning_leak_repair_cost_uk.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_73cf538625e04173aabd0f9bbe6a8f03.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_dc1803ecef984079b48b22ff72b82c58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/acordes_para_piano_de_canciones_cristianas_faciles.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_ab70d1ed43bc4c36b5371c5731be9a60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d93875-61e1-41b3-a874-00b788d68172/dragon_colouring_book_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/aasld_liver_lesion_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bb8df6-6ddb-49f9-8026-6386da12cd08/subaru_ea190v_pressure_washer_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0b99a5-56f7-4ed9-a678-ca7fc98401a7/why_is_my_washing_machine_leaking_during_the_spin_cycle.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_b1f00394459841049dbbcd91632397f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/how_to_look_up_my_medicaid_id_number.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 5096 bytes
SHA-256: a0cff2f461465391669c4916bd322fc33fe389537d9173c8dd642179e0277b07
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 10548 bytes
SHA-256: 931f390dd70362fc87da9ae8a54140ccf8636b598344b8143f2207eb45bd8f7b