Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bd0ddc96d06757…

MALICIOUS

PDF

98.9 KB Created: 2021-03-03 04:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b1ebdf9d9a69298ef3b8aecdf29a3b79 SHA-1: 9aeacdf876fa3ff0418234d478521a18546acfaa SHA-256: f0bd0ddc96d067571968f7b1750bb025cb7a1685aa81f59fab7b31a3af60d731
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a PDF link farm and external URI usage. The embedded links, particularly to gimoguvi.ru, suggest a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to drive traffic to malicious sites, potentially for credential harvesting or malware distribution.

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 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.
  • 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://gimoguvi.ru/strik?utm_term=resumen+de+la+iliada+corto+por+capitulos PDF link annotation
    • https://cdn.sqhk.co/fotutubujuf/aCMh6Mp/mumifal.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/vurazuwefaf_gibisuwusosoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5ff16d5408d90.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/fobupojowojon/nutritional_information_pasta_protein.pdfIn PDF document text
    • http://wafogaz.rf.gd/aithey_aa_ringtone_instrumental.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/klagte_brief_formaat.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/pride_and_prejudice_penguin_readers_level_5.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/drama_triangle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/lindsay_adler_posing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/68192457213.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/bizajefarebugibes.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/manual_auto_archive_outlook_2013.pdfIn PDF document text
    • http://zararogesa.epizy.com/begajopag.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/1982052796.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_off0001452b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452B 5228 bytes
SHA-256: b98574a6e443cec9d42148499353e451e5e0d59093889f5c454d28ce36d80a5d
font_01_sfnt_off000156da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DA 11860 bytes
SHA-256: 97de0569c79fe723bc1ad76018c37ddfbb404590425913b9d2725b7591e12e16

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