Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e9f5965858995f…

MALICIOUS

PDF

88.6 KB Created: 2021-06-09 03:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3b3d21a71681bad8eb2ffd42ec87195 SHA-1: 21271d594698d47eb834e75448282de8f6584f17 SHA-256: 92e9f5965858995fd9ff1360b0219bcff21fa2d7a62c2413148982d4c3838a8a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=easy+vpn+premium+mod+apk PDF link annotation
    • https://ranepudanaliv.weebly.com/uploads/1/3/4/0/134000181/jenoluluginepagogase.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/9159728.pdfIn PDF document text
    • https://juromavunux.weebly.com/uploads/1/3/0/7/130776553/3376507.pdfIn PDF document text
    • https://jalupibu.weebly.com/uploads/1/3/4/5/134520797/jixonuninipaxa_dajilemis_tegeveliselu_zoxibusamazef.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/aab0d3da7a5b05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144592629/how_to_add_electrical_symbols_in_autocad.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/towawodelirewugefageb.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/93073681566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143c9a52-10d0-4dc4-97ef-9608122c1c6c/how_to_remove_drm_from_apple_music_on_iphone.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144771231/graco_simple_sway_swing_battery_compartment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc56f17-1891-46ad-8835-b1141f7b77da/what_is_considered_a_knowledge_worker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4eb6b67-3a8c-4ea5-aecc-63694313dcdb/repatedetijabikukutebop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8a4652-7541-4535-874a-213282ed0803/what_are_good_adjectives_to_describe_someone.pdfIn PDF document text
    • http://kosumepifise.pbworks.com/w/file/fetch/144796368/el_cerebro_adolescente_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1bc18d-1084-44b9-9140-86572b7b0fd1/toderilevebotovumilowuvol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e701a929-c161-4be6-9dc6-1d2e7fafe8ef/nejijonerusefeximiremimus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe5a137-e781-44eb-922d-1e2a53da5800/samsung_galaxy_tab_4_7.0_battery_life.pdfIn PDF document text
    • http://guvevef.pbworks.com/w/file/fetch/144793317/cie_a_level_further_maths_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2614c783-9479-404c-bbca-4f616fb213af/download_cheat_uno_and_friends_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6079ac34-142a-455e-acfd-c43a4e24a03e/rixozefuzozadarub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39e2b92-b2de-41e7-b882-acbb060ea24e/sony_trinitron_crt_tv_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1708e76c-d7eb-4d1e-a6b8-35add71bbfce/58566009340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8483ee-a452-4c5d-b057-0f5128e9924b/plan_de_trabajo_en_casa_primer_grado_primaria_mayo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 3668 bytes
SHA-256: 3f56d8be7b61cf2c2f5b59c9fb9f62cb8613f2eb80732ada1218bac6c3749850
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5056 bytes
SHA-256: 1b26a031f0e05f604511108acd9b2352612a8cace647001280b66a89d51d6a07
font_02_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 15332 bytes
SHA-256: c1eb8425a911ec1bae570b642fbd6bf61304902eb9bcb067462a2d3fa9c0f990
font_03_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_04_sfnt_off000145c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2