Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ba9661de84d6a1…

MALICIOUS

PDF

64.4 KB Created: 2021-02-17 22:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0fc4ad5d7c3c74757345c0e6d94a8052 SHA-1: 2402ae40de670ebc7ddc02cb89ce8861605d99b0 SHA-256: 18ba9661de84d6a131a45bedc1ab6583e4bc6dedbc0002c696189680c116cdc6
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, some on disposable hosting, suggests a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=what+is+buying+and+selling+annual+leave PDF link annotation
    • https://cdn.sqhk.co/vejuwipem/WND1ghl/dragon_raja_reaper_class_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/dngh4jd/3d_paper_shapes_cut_out.pdfIn PDF document text
    • http://ita-yog.space/war_of_1812_apushnz83m.pdfIn PDF document text
    • http://fc-aromat.ru/nupogubiwisolujakusareleaex2j.pdfIn PDF document text
    • http://forecast.bet/8335578779q5s0p.pdfIn PDF document text
    • http://goldstein.capital/ticketmaster_tickets_e_tickets6tk5o.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/db4jjhb/jotepokabojoxazugezelije.pdfIn PDF document text
    • http://hookup750.website/filmora_video_editor_apk_prosub9y.pdfIn PDF document text
    • http://dirtygirl.fun/b._c._u._d_full_form4lwa8.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/rimepusox/vibabetomiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/82097628227.pdfIn PDF document text
    • http://mewarur.rf.gd/powege.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/palo_alto_firewall_configuration_guide.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_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 5304 bytes
SHA-256: aae01c91528deb19a36e5018974e34eb214d91ef7c076f51a317763156f2192d
font_01_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 10508 bytes
SHA-256: 01d87fea404ae7f568b3a7016f600c26984b3d09f0d56409153dcc8bfe760587

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