Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e0bf710e2f6545…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 16:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2096c69456d4056fb1375abab4b8573d SHA-1: 123b3a89b391ed5746dbd1acab0258a4460d0483 SHA-256: f0e0bf710e2f6545f18c33d1fbd0a70f275273b1d7a76e8f39b8b895d22a97d9
156 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 Weebly and Epizy domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+make+waffle+maker
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/5491794.pdf
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/c91d018b7cd865b.pdf
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/f509ce.pdf
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/lejazixigime-pexisawuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nawuvud/vifadonanokafebesukezokos.pdf
    • https://s3.amazonaws.com/devuxuzejozam/gomimudego.pdf
    • http://bamisuk.rf.gd/all_functional_groups.pdf
    • https://s3.amazonaws.com/poguvelefa/36869152470.pdf
    • https://s3.amazonaws.com/gudukupir/astro_universe_free.pdf
    • http://rigatage.epizy.com/principio_de_funcionamiento_de_un_motor_de_corriente_continua.pdf
    • https://s3.amazonaws.com/memobofilenabon/64418746433.pdf
    • http://niwaraz.epizy.com/kolapugor.pdf
    • http://posopexal.epizy.com/fluke_networks_intellitone_pro_200_lan_toner.pdf
    • https://s3.amazonaws.com/metubevozisul/emp_attack_survival_guide.pdf
    • http://nebaxowowugi.rf.gd/wololevelagibivobixano.pdf
    • http://xugonowelimije.epizy.com/96750169901.pdf
    • http://dixasimoxipux.rf.gd/59010706884.pdf
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_780edbeb2e4c4d358520b043fac76819.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_941c1184de0b4e5aa609c5faf0bf4487.pdf?index=true
    • 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_off0000e849.bin
654e4025c2fe3eefccc0390086a8758448c331ba342d5ad611f2b9233afcca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 4852 bytes
font_01_sfnt_off0000f8c0.bin
70de4f9bdd982de8ffe6bd808f26248ef4eaddee0abdcd05c38d06528d40b6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 11432 bytes

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