Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a5955b9c408abe…

MALICIOUS

PDF

71.6 KB Created: 2021-02-28 02:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 01d92dc08aa08a993994f7661f2f52ab SHA-1: c0e4aa6664745c8cb6f7a8cbe1a13657079c5564 SHA-256: 30a5955b9c408abe7a2d0a1271be58878d71025df242b44cdfd1510f76a94f9f
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains a URL that appears to be the primary lure, directing users to 'https://zajinet.ru/strik?utm_term=what+does+a+company+orientation+mean'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=what+does+a+company+orientation+mean PDF link annotation
    • http://onatural.space/78875150813grbwa.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/3265524.pdfIn PDF document text
    • http://mebets.xyz/13250103109n72jh.pdfIn PDF document text
    • http://organicnu.info/sigagowelupow8ef1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_603ad7310fad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5ff675f5c476d.pdfIn PDF document text
    • http://taygerr.com/banque_du_caire_annual_report_2018nsoj4.pdfIn PDF document text
    • http://tryse.xyz/75622954977e56zj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fdfd289aeb52.pdfIn PDF document text
    • http://shop-you.xyz/csgo_best_fps_guide_boost_2019m2kt6.pdfIn PDF document text
    • http://jixapijojuxev.iblogger.org/rarupik.pdfIn PDF document text
    • https://megelegekirir.weebly.com/uploads/1/3/4/4/134464092/911766106d0ea.pdfIn PDF document text
    • http://blancop.xyz/5214374802ftxgb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 5396 bytes
SHA-256: 3782b31c1a9afdacea3805cdd36b446a3c04e54e33521f296d383a075ceab42c
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 10456 bytes
SHA-256: 33e8d960b79a442fee5a86688d5d186e64a7e538651afb079de64f2956a0c518

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