Malicious PDF — malware analysis report

Static analysis result for SHA-256 457ad10ee59f1704…

MALICIOUS

PDF

69.0 KB Created: 2021-03-02 15:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 560aa53d15fbb642bee9fcf91ba35ad1 SHA-1: d0629dccc31caa6b103f3b9f2c0640cf56a5fc0f SHA-256: 457ad10ee59f17049e9e1aa2134e5d8d4639dcd030b0950ac4cabd3760cf95b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing infrastructure. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://golowaki.ru/123?utm_term=cal+spas+pomona+jobs
    • http://lastmarkt.ru/hp_image_enhancement_for_system_logon1iik8.pdf
    • http://itclick.info/8268986618alok8.pdf
    • http://tehnopolis.org/pexavopezozataw87lp9.pdf
    • http://topstop.site/ritomodipegiwafixozomujn6dp.pdf
    • http://hh666o.site/218776415363pftq.pdf
    • http://beststudent.space/95936782458qseff.pdf
    • http://koolmaxt.online/lefexefibufubojive1fb27.pdf
    • http://swast-group.website/befesaxawepal7vyay.pdf
    • http://bluebadgeapproval.com/nerakimijogadpua.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/butod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudowo/28520363153.pdf
    • https://s3.amazonaws.com/belopudevuzuza/3949688943.pdf
    • https://s3.amazonaws.com/jonora/free_leaf_stencil_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2fd.bin
4543e7c3e353b899704e81b108ed15849b6d34f4998d3e0f725255e2cf99b41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 4992 bytes
font_01_sfnt_off0000e3dc.bin
d063639dab080479d0126e60e66fa7384c284b9960d7cf94849319757f181300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 10524 bytes

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