Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a0ceba75e2a46d…

MALICIOUS

PDF

74.9 KB Created: 2021-01-23 03:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f33e83660f8fe816bf6e596febc58118 SHA-1: 1b107a8cb801286c8087494e1f3d2a94b006a7ae SHA-256: e5a0ceba75e2a46d0f4df93452bbf276c865bfe56a6a22c86a0b8b3d2a952867
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors. Heuristics indicate this is a link farm designed to manipulate search engine results or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=epson+tmu+220+manual In PDF document text
    • https://cdn.sqhk.co/wixefawoz/wU6jjji/physics_balls_game_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/jd1ihPP/ritobutukawokogopepefox.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/BCicbge/aliexpress_brazilian_lace_front_wigs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_600b686edf748.pdfIn PDF document text
    • https://site-1180493.mozfiles.com/files/1180493/cake_decoration_with_fruits_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/Fjchhhe/dinoland_usa_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5fc5995090b0c.pdfIn PDF document text
    • https://site-1177122.mozfiles.com/files/1177122/79263490833.pdfIn PDF document text
    • https://site-1168215.mozfiles.com/files/1168215/batosuwiwufozuwo.pdfIn PDF document text
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/eba901c248d0.pdfIn PDF document text
    • https://site-1179150.mozfiles.com/files/1179150/13568480570.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/fhfjbij/mebuzawuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugidujesu.epizy.com/xilutafapesike.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/19981359625.pdfIn PDF document text
    • http://zalezir.epizy.com/49443958961.pdfIn PDF document text
    • http://momerizimapunu.epizy.com/6847123030.pdfIn PDF document text
    • http://xotesevuves.epizy.com/filter_google_sheets_sort.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5100 bytes
SHA-256: dab9b77b806e254a9ea26a8ceca43f1d98fe5c39ccb977fdcd5e27cc340580d6
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 13416 bytes
SHA-256: eca586c7645f3f3c1a363f835e3f96d8b6010bca832676a54102b8e75911d653

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