Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85374cf9c752541…

MALICIOUS

PDF

74.2 KB Created: 2021-06-04 11:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fe195ebde9e70b90aed468305bc31e9c SHA-1: c632e21605f9bc7c4c45a1c62a060fb9d9575a11 SHA-256: a85374cf9c7525412bd27e92babbfe368bd37f87894dd0b8013a665c9e8fd482
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, presenting itself as a search result for sheet music to entice users to click on numerous external links. The majority of these links point to disposable hosting services and are likely intended to drive traffic or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/pbw?utm_term=alexandra+burke+hallelujah+piano+sheet+music+free+pdf PDF link annotation
    • https://sosegasum.weebly.com/uploads/1/3/1/4/131437139/mowef_kadinajokiremiv_baruruxamiro_torij.pdfIn PDF document text
    • https://doxezasofe.weebly.com/uploads/1/3/6/0/136088479/mobixigejunimijiro.pdfIn PDF document text
    • https://vitaworitevazol.weebly.com/uploads/1/3/4/4/134484496/3716314.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/4545729.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/d4c784c151f61b.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/roxikenabufafu.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/lumesiketu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144451188/17466153555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044575a5-df50-453b-a12d-23714cb8dda1/the_heirs_korean_drama_songs_download.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144577809/20623282404.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144445932/101_okey_plus_ip_ykleme_pepsi.pdfIn PDF document text
    • http://ronakiko.pbworks.com/f/download_need_for_speed_most_wanted_2012_pc_ita__crack.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/muneban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610917c4-b589-46b5-a696-8da5847275ee/58905972124.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/gua_aplicados_3_contestada_bloque_2.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/sinivevowarapanenebo.pdfIn PDF document text
    • http://lakiluxodev.pbworks.com/w/file/fetch/144566841/does_ian_come_back_in_pll.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/bally_5000_plus_slot_machine_manual.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/how_long_does_ophthalmic_shingles_last.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/22455783643.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/construction_project_status_report_template_excel.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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 5732 bytes
SHA-256: c5fc3c7723888d78da0b2831cb4b2896afc7599b8d7204f21cd3aeaa1899eb6d
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10792 bytes
SHA-256: a867275f6930c0d405f985357317785fcf8e47c688aabcb65e9085f6435c7721