Malicious PDF — malware analysis report

Static analysis result for SHA-256 c391d60b22d9dfbd…

MALICIOUS

PDF

76.2 KB Created: 2021-03-02 12:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca45cdf4b99b654e0e50413c66f7adce SHA-1: 51038b9563e545a01fa29f8ba7ff8d0c59d07ae0 SHA-256: c391d60b22d9dfbd0562c337cc6613596a3883d0abf8c0cf60e1deee21f5702e
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 high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate that the primary purpose is to redirect users to potentially malicious websites.

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://jottigo.ru/wix?keyword=haass+a+world+in+disarray+pdf PDF link annotation
    • http://vykupavto54.ru/tujipanagupe9m0yn.pdfIn PDF document text
    • http://xuriretijidaja.22web.org/zamatidovudof.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/iBWiieT/world_war_2_battlefield_finds.pdfIn PDF document text
    • https://gawupuvuto.weebly.com/uploads/1/3/4/5/134530234/xogudematiraxog_jewar.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/3688853.pdfIn PDF document text
    • http://weroserigo.22web.org/nofamubin.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/voxadipako-wavusar-xesanupegerali-kesurajolegu.pdfIn PDF document text
    • https://kevofogag.weebly.com/uploads/1/3/5/9/135962027/a8376311cc9.pdfIn PDF document text
    • http://jikonuja.22web.org/bhangi_songs_free.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/vikufifedidu.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/dh0haii/epic_games_rocket_league_price.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/kogirubokosa_kowof.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/hjghkBv/golden_boot_soccer_reviews.pdfIn PDF document text
    • http://xsale.trade/56405996989s9sf6.pdfIn PDF document text
    • https://rumirasikimuzib.weebly.com/uploads/1/3/2/7/132710795/teleguzudelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwojewemuxa.epizy.com/javascript_format_json_string.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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 5188 bytes
SHA-256: 826271e770e54c3d98c737ba048242faa4f27f6d474910456ea28ee9f0dffb64
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10428 bytes
SHA-256: 68860cd7cc7f9b65604cbd6e8c7ea16d5eee86646aa0fff16fec5e3d9498e58e

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