Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ba96427d6065ad…

MALICIOUS

PDF

63.7 KB Created: 2021-02-14 03:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af4d76c94669c657320e2084fa555f3c SHA-1: e3903481b70d305dca2a92bb0bcea41233487326 SHA-256: 85ba96427d6065ad2eb6e6b5669a2719598480c55f3061dba7ee652ea54dec56
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

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://druttle.ru/wb?keyword=electrical%20instrumentation%20lab%20manual%20pdf PDF link annotation
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/6480685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_5fd13d5c0392d.pdfIn PDF document text
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/basugobek-gizesap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5fc8b3e6e9bd5.pdfIn PDF document text
    • https://mulanazujejuxu.weebly.com/uploads/1/3/4/8/134855463/kavukiwagetuf-wunolowa-mununu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5fe16bf3d2317.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/sawojexeg.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/demejuvanop.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/vejewexide.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/guravedaloj.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/dbd0a72a451f877.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/f0ed6a7404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisik/63370077551.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/67863549497.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/zalisekepuwufodipanin.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/intellij_generate_javadoc_template.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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 5400 bytes
SHA-256: b948d02bf690aada7696294696d4004b931f2d67b86336ca879e5d7821070bd7
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 10136 bytes
SHA-256: bac218272c47755e2023f4ebbf63cbf167e2443f84f0dadcf40daca02f872163

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