Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bf6b874fb652b2…

MALICIOUS

PDF

82.2 KB Created: 2021-03-27 16:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 679a9c8c0fb7c4be98bb8bd914723b9d SHA-1: 168c4aef5d114882b254286a80540cbb6f1414ca SHA-256: 00bf6b874fb652b2260d60d249f0f1ca77d024e214787fc2812226ced6b2f10d
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which are generated for SEO purposes, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=portal+flash+version+cheats
    • http://peuly.xyz/how_to_use_rug_doctor_on_couchmox8m.pdf
    • https://voleruzogiz.weebly.com/uploads/1/3/4/6/134696629/7f396fa5e39.pdf
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/felowez.pdf
    • http://itnegozio.info/area_of_an_open_rectangular_boxipzlk.pdf
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/4651935.pdf
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/6742874.pdf
    • http://oyuncuxx.com/how_to_open_a_jammed_supra_lockboxh0bnc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lekozuni.epizy.com/twitter_280_caracteres_android.pdf
    • https://s3.amazonaws.com/mupukesunobaga/jasirupuridojarof.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_5610b78b2a6d480ebe0d9fc81bb207aa.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_f9f75842e9434833b9c4627e0363d799.pdf?index=true
    • https://s3.amazonaws.com/panalipolifod/tepolafodevajivadenuto.pdf
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_5f6c77f7b0174239810b2ae0850f16ec.pdf?index=true
    • http://pesezozeve.rf.gd/tisokakadavuxogo.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ffc2126dc8554f7aa602b5913eac2e85.pdf?index=true
    • http://nototen.epizy.com/zaziraburanonenediretusi.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ce.bin
9dd1d9afca8109e8d244182ce98b44d944c43fe8ceb83e4bba776ca525ccbb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 4820 bytes
font_01_sfnt_off0000f11f.bin
6e56f11e89e9c96077b3e605fa7a80e207306bd737766d737980c516e704bbc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 11568 bytes
font_02_sfnt_off00011849.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 16204 bytes
font_03_sfnt_off00012d76.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 4324 bytes

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