Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf66eee578875e04…

MALICIOUS

PDF

83.1 KB Created: 2021-05-01 20:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0f606cba4b4ff8778a6a62ce13995754 SHA-1: 8f16fd9a9a0cd56cbae63c8da490a6ddbcc177a0 SHA-256: cf66eee578875e04cabbfa1886f4daaf3af68ef4b36a1573e25ecf7381ea8c3a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be disposable or used for SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=china+stock+market+news+now PDF link annotation
    • https://cdn.sqhk.co/fejukomus/HuTdRid/pac-_man_championship_edition_nes_demake.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/jRWiiaw/95057906859.pdfIn PDF document text
    • http://openlait.pro/vupobubeweniq2bi.pdfIn PDF document text
    • http://newyearshop.site/721786095282raxd.pdfIn PDF document text
    • http://investmag.org/957280110205zin0.pdfIn PDF document text
    • http://erogancolumbia.site/how_many_calories_in_a_maple_bar_doughnut4h9x5.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/jbThdqy/jasper_reports_tutorial_javatpoint.pdfIn PDF document text
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/12a0c15f4a67.pdfIn PDF document text
    • http://podarokinsta.site/56852033599j2vog.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/4036234.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/fhftNhg/66952649062.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/tom_clancys_rainbow_six_siege_-_deluxe_editions21aw.pdfIn PDF document text
    • https://rifituxajigibik.weebly.com/uploads/1/3/4/5/134519767/8902242.pdfIn PDF document text
    • http://wisitens.online/how_to_reset_airbag_light_on_chevy_coloradobz59u.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
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_9dd94b6e65854a5abab670152574d8e9.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_896d281862524532a63c11e11b9c975e.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_df27ffc7d2024e34871123284f44880b.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_65608c713ea443538f6b7416ec210a33.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_e75ed5677ac84efc9beda524cca7331e.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_68485967352843fe8bb4edf5853e3a7a.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_31306af769854b8f87bddd3be66918a1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 4976 bytes
SHA-256: 1d1619c2ef6e00adee4983fd5e73a03add254eb981969cd175b7702a7a10844a
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 11896 bytes
SHA-256: f610a44c343a128e362251315520039fd157a2fd8dcb8619d18750fa21052934
font_02_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3