Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3ffbbc836b6bfd…

MALICIOUS

PDF

82.8 KB Created: 2021-03-06 11:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6ef93618860936ca88cd090b6964592b SHA-1: 1b0e43d61baaae557c2a6c05518ff7304bc72ce8 SHA-256: db3ffbbc836b6bfd0fccac8bac0f304f9bd0b48c5a3e47f54715a5259a76746e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://dafemum.ru/123?utm_term=thermo+king+alarm+codes+35 In PDF document text
    • http://vobigabifinu.22web.org/24480934514.pdfIn PDF document text
    • http://fridgeservice.ru/12153318328g5zte.pdfIn PDF document text
    • https://wefopizek.weebly.com/uploads/1/3/4/8/134849363/746819b4c6b62.pdfIn PDF document text
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/20416d8a0.pdfIn PDF document text
    • http://winsbig.space/pibepadambqokv.pdfIn PDF document text
    • http://sokolov.fun/hinterland_series_4_episode_guidexx3yd.pdfIn PDF document text
    • http://keepmaxi.space/adventure_communist_events_impossibleoarm4.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/17773.pdfIn PDF document text
    • https://tenomexob.weebly.com/uploads/1/3/1/1/131163969/vomufoxanenejavinuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_cdbf598e2b604418b97f30a15b2faf8b.pdf?index=trueIn PDF document text
    • http://xiwaresijo.epizy.com/36884519911.pdfIn PDF document text
    • http://bilunijo.epizy.com/rodezirodawaneketegux.pdfIn PDF document text
    • http://pulijivugis.epizy.com/reformas_borbonicas_militares.pdfIn PDF document text
    • http://bivezekamolekaz.rf.gd/28767463833.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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 5656 bytes
SHA-256: 714defa88cbf34173dde2f4f995e32047a6132922589e8f38d255c472d1e32ac
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 11380 bytes
SHA-256: 0296212af9d9cf4e9f8fee5ffe6dafeedc095f4ff83508c4201af39f4b94972e

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