Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fab35422bbdf4f…

MALICIOUS

PDF

72.8 KB Created: 2021-02-23 21:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7093d9f497b5b7c0e5697b14b4b4cc4 SHA-1: 539a48044099392a80e1efb129e21dd18812c4e9 SHA-256: 90fab35422bbdf4fdda2a1bdbe35c5ac8d077f2bb32ae0cc0e5b46b98d94c61a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The PDF structure and heuristic firings indicate it is designed to redirect users to external websites, likely for malicious purposes such as credential harvesting or further payload delivery.

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://seumenha.ru/strik?utm_term=agile+method+vs+waterfall+method PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5fe8a290d6221.pdfIn PDF document text
    • http://nanolenka.xyz/school_management_software_php_free_downloadv4yk4.pdfIn PDF document text
    • http://vinograd.io/58335735272jq2pz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fe046a9e40a2.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/hjs6an2/average_cost_of_dental_implants_in_phoenix.pdfIn PDF document text
    • http://fixmarker.fun/bloody_roar_2_ps1_androidh7hso.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/mBZjcgg/best_japanese_keyboard_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fe8569b89cf3.pdfIn PDF document text
    • http://redit.fun/retabakilogedemepadbkm01.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/2hbgchj/57669758194.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/Qhdo0MR/pikatexejok.pdfIn PDF document text
    • http://itclick.info/dafudim9vii0.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/gElyijO/siwanaxa.pdfIn PDF document text
    • http://medtechnika1.ru/helly_hansen_life_jacket_size_guidegcs80.pdfIn PDF document text
    • http://topshops.website/zombie_crime_shooting_game_mod_apkh77n8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_600d8a7701aaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 5460 bytes
SHA-256: e371056f6aa0df5145bc9238bd2b23b29627de227b4327927193e424b1e6d0b2
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 10180 bytes
SHA-256: a58dd98124d25caf9b77dd4770f9c5e09806ec6e356a5acdc844252b8814f3ea

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