Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e01f8f8426dcc9…

MALICIOUS

PDF

65.4 KB Created: 2021-01-25 07:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c72f16fcf2c1fb7ad39f934e11e831e SHA-1: 450cb0760df3bd611a422fc38314db14f037484f SHA-256: 04e01f8f8426dcc9e9c1a80ae61e1168f56e85fd92d63dd4ba94b9e5c401cc31
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/wb?keyword=red%20ball%204%20volume%203%20crazy%20games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5fe8b98bb1b91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ffc7472eb40a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff4b05ab7d7c.pdfIn PDF document text
    • https://vofaxarexokuj.weebly.com/uploads/1/3/4/7/134762848/zilezale.pdfIn PDF document text
    • http://abanca-electronica.com/jewejulakfwyye.pdfIn PDF document text
    • http://hookup754.fun/115887120622aq8j.pdfIn PDF document text
    • https://wademaleg.weebly.com/uploads/1/3/5/3/135346716/0ba63a8515d6558.pdfIn PDF document text
    • http://dkmz3.club/54530076039fep6r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_6007f43ed599f.pdfIn PDF document text
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/1023369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zunaxixe.rf.gd/flirty_answer_to_what_are_you_doing.pdfIn PDF document text
    • http://zovawawopo.rf.gd/94834590760.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/xewifaripexagimenon.pdfIn PDF document text
    • http://tifuponakeg.epizy.com/towijukekiji.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/detejinibil.pdfIn PDF document text
    • http://fiwarirekagugen.epizy.com/28391929656.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_off0000bec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC8 5872 bytes
SHA-256: 84ada80fae41bcedf7c2c2658fe778d8da0c61c922c34d56fcded4e663430782
font_01_sfnt_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 11448 bytes
SHA-256: 939011b9ba841ec68bb5f4ef3b4f63f7a862479608617eece382064990fd431e

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