Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb36d34debde7f3e…

MALICIOUS

PDF

139.6 KB Created: 2021-05-13 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae912d9584c40f8266c8858b2eebb330 SHA-1: 2a998e68f459d467940b4815b11023a27e1efff2 SHA-256: fb36d34debde7f3e4a272fd0871983a17af8eda5ffb0bea37bc13da33a95379d
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of an embedded JavaScript stream and numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nipisod.ru/strik?utm_term=the+world+until+yesterday+by+jared+diamond
    • https://cdn.sqhk.co/zexupibo/iegj6gj/450915471.pdf
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/3742917.pdf
    • https://cdn-cms.f-static.net/uploads/4448995/normal_603c2a8e0072d.pdf
    • https://cdn-cms.f-static.net/uploads/4407733/normal_606e306f93129.pdf
    • http://salonhq.xyz/86193015179qnjau.pdf
    • http://rexevivejegox.scienceontheweb.net/zimubud.pdf
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/1519704.pdf
    • https://cdn-cms.f-static.net/uploads/4488810/normal_605019959b60c.pdf
    • http://kinemulawaw.sportsontheweb.net/tedatoziwabeturotefu.pdf
    • https://cdn.sqhk.co/toxodabatot/mrUSCjh/gestion_du_personnel_d_une_entreprise_commerciale.pdf
    • https://cdn-cms.f-static.net/uploads/4403282/normal_600be7df323bf.pdf
    • https://cdn.sqhk.co/jipodipotaj/jjhcvhg/wosaxafovukefonupi.pdf
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/zibezaz.pdf
    • https://cdn-cms.f-static.net/uploads/4413126/normal_602e7265ea047.pdf
    • http://evatopshop.xyz/bipunirujafudiluzaxusoladu29t5.pdf
    • http://idclick.cash/my_frigidaire_oven_will_not_heat_upq71ju.pdf
    • http://vk-settings-change.online/17089992135vgbvn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://weponigonimogo.myartsonline.com/alta_gerencia.pdf
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_8eaca96ebbfd406d8089929605303177.pdf?index=true
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_78d51deba6a740c9afe08a45e959cf0a.pdf?index=true
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_67e7b1917c374056b47d789775cd9b56.pdf?index=true
    • 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_off0001e5fc.bin
92c4e06a2d00baecde26a32ba988eff096d1098d7308f9a00e1422f12c5728fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5FC 5424 bytes
font_01_sfnt_off0001f856.bin
44b0f9244d96379f54d7838730a44490fb61628354fd641fb24260bf3185f1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F856 12672 bytes

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