Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f441636bbe58df…

MALICIOUS

PDF

117.8 KB Created: 2021-03-03 22:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e63a86fdab7718b1d1b0227a8d3f30a SHA-1: 897931469366f35091ecb18d8d374cf468b89504 SHA-256: e0f441636bbe58dfcde04c25896c708472323a8fb23530a016b8009ddc290562
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used for malicious redirection.

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://resalured.ru/aws?utm_term=texas+reading+first+fluency PDF link annotation
    • https://cdn.sqhk.co/duzimisese/hbJ8pbQ/horizon_camera_app_alternative.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502245/normal_6008e089a966f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5fe86d425fa4d.pdfIn PDF document text
    • http://didanak.22web.org/58015045606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_601b4d64dc4eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_602410c64d181.pdfIn PDF document text
    • http://folivapizi.66ghz.com/11200652964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_5fd9637985433.pdfIn PDF document text
    • http://beroveretugir.iblogger.org/shark_professional_steam_mop_replacement_parts.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/44813634937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_5fe7d7ff14159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fc701327f034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_600b4c2f3d7dc.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/la_crosse_technology_clocks_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/RR33hhn/crunchyroll_premium_membership_benefits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofilunalosew.rf.gd/soundhound_pro_apk_2019.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/72514395364.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/what_type_of_oil_filter_for_2016_toyota_corolla.pdfIn PDF document text
    • http://menerolefu.rf.gd/free_teamviewer_version_12.pdfIn PDF document text
    • http://padewowupawit.rf.gd/92312640333.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_off0001921f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1921F 5308 bytes
SHA-256: 9b826577306497a53348a19d64a57d243073104d134bbde3dbbf1b368ff75ca9
font_01_sfnt_off0001a448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A448 11236 bytes
SHA-256: e45c368a3347cfb252d4c4f9e9fa7b82579fed122593a506658d519cf879a9e9

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