Malicious PDF — malware analysis report

Static analysis result for SHA-256 795fc441b431ee5c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 05:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1339103194ba35342f23ee308ec7806 SHA-1: 690f15bc5e372d4446f9f3d95ca841deadd38086 SHA-256: 795fc441b431ee5c1a883ea4152c19243a1cadbe45ff4f18019f5e511cc90d04
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/award?keyword=architectural+design+principles+pdf PDF link annotation
    • http://lnstagramcopyrightmanagement.com/4868329597n14fx.pdfIn PDF document text
    • http://immorta-cross1.club/homework_topic_2_biology_answerslcr3s.pdfIn PDF document text
    • http://digovin.getenjoyment.net/classical_approach_to_management.pdfIn PDF document text
    • http://aicberg.net/kyocera_fs-1135mfp_driverxwjwv.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/71611638943shkck.pdfIn PDF document text
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/159ffbb82547.pdfIn PDF document text
    • http://kushtanash.ru/91482390968dvom1.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/3094212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e205dc0e-8340-4560-b190-a728941299d5/what_does_it_mean_when_your_car_says_ice_possible.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/calendario_serie_2020_19.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_230ca1c0c50c41d9aca2d2ed1742b865.pdf?index=trueIn PDF document text
    • http://polabufu.myartsonline.com/dipivozuzatato.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_f6784866ef184b8c8f030433f4d771f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c07006-b1db-44b3-9a06-c51d8aa8b79b/gadasubobizivuwin.pdfIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_0e509d15ad894e03a7da48553b19e3b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b20f549-bb01-42c1-83de-0e155df4247b/toyota_camry_se_hybrid_2020_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c657b62e-acae-4f7a-a6b0-99962aea6081/purijukadedebawoxofanivi.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_00d7d82208d14c2e960e473b9d886e79.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_2ab909019dad4a0ea8f52666fffeb654.pdf?index=trueIn 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_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 5408 bytes
SHA-256: bb20cd319948eb2a9bc92b821597038cba97d57e1ebd7ab3d314193ae32dd3aa
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 10536 bytes
SHA-256: a64bfeeadbd11c999bdb2f1c529c80e140468a06f6dfbf5bc1907853fffa7391