Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e770018d7190c1…

MALICIOUS

PDF

74.5 KB Created: 2021-05-13 17:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7207b3e7477f208b3f68dd938691153b SHA-1: d97bcae41c92cc44f32c5509e99ae3995928d4f2 SHA-256: 33e770018d7190c1af9107f13646172fb6427ba81b0a4f643c876bc5ec2cda75
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for further compromise.

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://xezojetit.ru/strik?utm_term=restaurant+general+manager+jobs+austin
    • https://cdn-cms.f-static.net/uploads/4478133/normal_603fddeac72aa.pdf
    • http://pimadukemaxi.22web.org/559675163.pdf
    • http://oneplusonemain.xyz/8403310795129drd.pdf
    • https://cdn-cms.f-static.net/uploads/4447914/normal_604a4af05116b.pdf
    • https://cdn-cms.f-static.net/uploads/4370319/normal_600a9c6a30e5d.pdf
    • http://sokfresh.fun/glitch_cam_pro_apk_premium_2020tw2yy.pdf
    • http://lnstagram-helps-contact.com/the_pursuit_of_holiness_study_guidexetar.pdf
    • http://salonlabs.xyz/37586752131v0dbf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b9b72f84-726e-471e-97f8-db2457b556b3/6415608085.pdf
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_7bbbc3e6dc4f43adb8c9a830da7f5a1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4aa475dc-7d8f-440b-891e-883226f594e0/zoxorupejajugisuruzuk.pdf
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_924d125ca21e4a30afbd7d835ebce3a3.pdf?index=true
    • http://jixoxila.epizy.com/mitobapo.pdf
    • http://fapubogodomeduj.epizy.com/87797795616.pdf
    • https://uploads.strikinglycdn.com/files/b3ccd31c-10da-465b-a047-7d7cf0b762d2/indicator_species_analysis_dufrene_and_legendre_1997.pdf
    • https://uploads.strikinglycdn.com/files/affc5af9-cd54-4031-a1db-8b60a15e46e5/86062989505.pdf
    • http://duzatip.rf.gd/bank_clerk_exam_syllabus_2020.pdf
    • http://vodulisus.rf.gd/computer_full_form_of.pdf
    • https://uploads.strikinglycdn.com/files/8588047f-698a-4a48-b345-947b35942f27/75008488282.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_off0000e74a.bin
78d737ce3df619b49e53260221f09cc22ad4c67557e55f7e3a82f12bacca751a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 5228 bytes
font_01_sfnt_off0000f906.bin
3c6a544b600103177333997a5dfbf5aa78cb4c777b72217bdd13263bb2a247d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10464 bytes

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