Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd510eebe9421a12…

MALICIOUS

PDF

79.3 KB Created: 2021-02-14 16:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bdaade196ef584f50667ef0b625d638e SHA-1: c1c77e90ed13c86b93840c041309d203403610fe SHA-256: fd510eebe9421a123b6ca1be2238af56319f0f0cdf08f32b01e391826d5be12c
194 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of a 'download button' heuristic further supports a deceptive lure. ClamAV detection as 'Pdf.Phishing.Trojan' indicates a known malicious pattern. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to a compromised site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=vbs+registration+forms+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5ff18c94b3daf.pdfIn PDF document text
    • http://securityverifiedservices.com/aditya_birla_mutual_fund_address_change_form0cor3.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/jefibazilinasubaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6011387cef4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fdc8cdc28427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_60220ca297c04.pdfIn PDF document text
    • http://trysoda.pro/11936151249z22es.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_5fc7a3b59d493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_601e885be5f7c.pdfIn PDF document text
    • http://basepati.22web.org/71504597211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_601521090a3b2.pdfIn PDF document text
    • http://quinzsy-studio.design/bni_business_buildersn7nta.pdfIn PDF document text
    • http://tikonazab.iblogger.org/12172149110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6015ff020ad25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefitog.epizy.com/pexenewir.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/chris_paul_thunder_uniform.pdfIn PDF document text
    • http://luruloligof.rf.gd/bubukomonasenipifivu.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_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 5324 bytes
SHA-256: 5111b9112760888f38ff9a331f45aee3fa1d6b696f5aa0a45cac175655b8e83c
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 10724 bytes
SHA-256: fd58275532fae565ee04579f8ed919b6bb324baf4283f3c389d9b70b0841b558

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