Malicious PDF — malware analysis report

Static analysis result for SHA-256 092d04cd7baaaf99…

MALICIOUS

PDF

70.0 KB Created: 2021-02-21 22:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: affe9cb0698ab4293338bc95045382b7 SHA-1: 5ebb20c5a0303865c8ba91cf3acac6be4d0e0177 SHA-256: 092d04cd7baaaf99e28db4e8bcdac48393703406b42ff15c8ac87efe09256be3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary external URI pointing to 'jacksth.ru', suggesting a redirection or download attempt. The document body, though heavily obfuscated, contains text related to 'architectural scale' and 'wkhtmltopdf', likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of multiple external links and the high confidence detection scores point to a malware distribution or phishing campaign.

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://jacksth.ru/strik?utm_term=how+to+use+architectural+scale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405414/normal_601dd3ff3015d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_600df74002e61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5ffccd8214d96.pdfIn PDF document text
    • http://osthondroz.com/bufawawetoludipubak6kvze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_5fdae1f7bc0cf.pdfIn PDF document text
    • http://xekugesakurupab.22web.org/togatufobafatedigipizitux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_60067ed8cc9be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_5ffd1f5cbf06c.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/cglhe7Y/my_bunny_runs_in_circles_around_me.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/YhgBWHz/paypal_account_hacked_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/dhdjaLe/blue_circle_red_cross_road_sign_uk.pdfIn PDF document text
    • http://indir-kazan.com/tresca_yield_criterion_wikipedia8h8kz.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/biadiJI/naduj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc6936da1e1d.pdfIn PDF document text
    • http://weareanonymous.org/international_law_definition_by_oppenheimnf79d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatilibudavelit.rf.gd/rogokoluzalen.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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 4940 bytes
SHA-256: 3b0d05150c5561cb8bd7ee24d2cd064f1e4796afac3738171dead37e1a92f1f3
font_01_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 10856 bytes
SHA-256: 30c90dfadb7673a0eb9ab7a970cb6947c288c396ce24c9fb4ac18488da139a66

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