Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba3cd54d5e9559d…

MALICIOUS

PDF

78.7 KB Created: 2021-02-23 01:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4a394bde97916ca022c12f06dc98b60 SHA-1: 9d404475f7b01398974397f88c98e9d6dc9d0785 SHA-256: eba3cd54d5e9559df1550e6d38814d9ef2acda716322890be2b043ad5dad78c8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to external sites.

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/strik?utm_term=stihl+fs+56+rc+replace+pull+cord PDF link annotation
    • http://fortuneo.best/jowadoxuxodabekijazixe7flrj.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/4660328.pdfIn PDF document text
    • http://itwow.info/mma_fight_live_updateslybi0.pdfIn PDF document text
    • http://elerctum.org/flow_chart_template_in_word_2013vq9b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fc916a6a8e89.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/jodexodajorop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fddf78b8cf80.pdfIn PDF document text
    • http://fujubipe.22web.org/22162671104.pdfIn PDF document text
    • http://replyua.site/12404928862xwhyv.pdfIn PDF document text
    • http://chuvashovfamily.ru/prparation_physique_boxe_anglaisebra0i.pdfIn PDF document text
    • http://j3vnci4.xyz/bepebomanatavamupu19qrb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5fffa47fcfbc5.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/8830633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepusijanakigat.epizy.com/19525595179.pdfIn PDF document text
    • http://pimuxexud.epizy.com/7106208910.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5624 bytes
SHA-256: 94427ccde1892e203d8646e09a10644c64aea5c6f59e9fa5e72e5e02007e9fef
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 11448 bytes
SHA-256: 90ece56add2e0f803a5b26d39b410f41e1beb83afbc618b00c6d5cb2c0a47882

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