Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b1adcf74d0749a…

MALICIOUS

PDF

69.0 KB Created: 2021-03-23 22:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 40adad50d12a66abeca1a3a9995bb4ee SHA-1: ac44447ec1812646327f1a7b918ce6cffcab6c07 SHA-256: 30b1adcf74d0749ae5083e0c35fdaf207b35a7861204772c583fda301aa5164b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to an 'American English file' teacher's book, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=american+english+file+2e+2+teacher+s+book+pdf PDF link annotation
    • https://cdn.sqhk.co/fejukomus/jcwjcuY/13083973875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405409/normal_6004dae64bf36.pdfIn PDF document text
    • https://purabadixubemik.weebly.com/uploads/1/3/5/3/135399060/dcfdb9.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/le_cogito_cartsien.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/bazudejapixu-bokanutekuleg.pdfIn PDF document text
    • http://kanotisutujag.iblogger.org/deveguxikofulabojexavosu.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/hfuJig0/19193419121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_601f8e8bde2e7.pdfIn PDF document text
    • http://sagokorize.22web.org/sudonesujururediteninofe.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/45998017306.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/mHjLrg7/zupugamepaduxitamumikuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_600c3736a1fb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kirogebi.epizy.com/cghs_renewal_form_online.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/70538628512.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/is_fl_studio_fruity_edition_worth_it.pdfIn PDF document text
    • http://zabusokaruzovi.rf.gd/baillie_gifford_managed_fund_factsheet.pdfIn PDF document text
    • http://renenubulasuf.rf.gd/vixax.pdfIn PDF document text
    • http://botawaxugeb.epizy.com/41269823069.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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 5896 bytes
SHA-256: ec6e70351b65f385a2741124c1f939d05a8dc25eeaa12523f126b3d1f373c2da
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 10260 bytes
SHA-256: d464e59c19fd70e484c6e378b69bd19a970b39f01bb36b8b6872b999cd4a552c

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