Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad95511a5881b8e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-11 06:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8532b346fb27bad35ec12e2ab9b0eb58 SHA-1: 13c38c1050117f547dd57eec40717a6aaadefa64 SHA-256: 5ad95511a5881b8eeb6a0fa9901b12b0979d0a894f1c78c4449e1bb5c4b229fd
226 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document may instruct users to install remote support tools, a common tactic for social engineering. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://dugedepap.ru/123?utm_term=aion+mobile+game
    • https://cdn.sqhk.co/rogokivika/jiaNhas/fugovinobapete.pdf
    • https://fagoloda.weebly.com/uploads/1/3/4/6/134649735/0705d81.pdf
    • https://cdn.sqhk.co/zatovafer/U7hjgd1/6250544368.pdf
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/6984366.pdf
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/sifitijud.pdf
    • https://namovisurov.weebly.com/uploads/1/3/5/3/135338224/dajanofejulenu-muwuxelegomoze-ziruxo.pdf
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/746a6ca07da.pdf
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/birojuju.pdf
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/9474073.pdf
    • https://cdn.sqhk.co/xedufoga/jaijicJ/97902893355.pdf
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/zulewutonipu.pdf
    • https://cdn.sqhk.co/nosuterib/ghiQvi6/dimafabiduvobi.pdf
    • http://gerawat.22web.org/irminia_care_sheet.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/novukobivof-fixejuxokorazu-rupibunuk.pdf
    • http://kugugulobirujut.22web.org/jojeloru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedimuta/negovumo.pdf
    • https://uploads.strikinglycdn.com/files/8b2ca014-6922-4631-b95a-bf8d356d44c4/devel.pdf
    • http://gufolisalowu.rf.gd/61078408739.pdf
    • https://uploads.strikinglycdn.com/files/888b50c4-59c2-4951-a33b-e6ef4abf34d6/83894190769.pdf
    • http://rarezutawuwelam.epizy.com/iferror_vlookup_across_multiple_sheets.pdf
    • https://uploads.strikinglycdn.com/files/1b84847f-d91a-432c-9050-1a82df299564/best_emergency_food_supply_for_families.pdf
    • http://pojifatuvu.rf.gd/83642976073.pdf
    • https://s3.amazonaws.com/domegagowevag/emotional_freedom_technique_eft.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_off0000f9be.bin
a62af557024c30dc8df30910fb3c3f4d03ea9ec233029ac48738ac61164563d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 4860 bytes
font_01_sfnt_off00010a3a.bin
c5bedbeb172f8031f085da4cde2e051f4de82b039e938ea7cad36299a598d3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10472 bytes

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