Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bcee444a4ad7df…

MALICIOUS

PDF

72.0 KB Created: 2021-02-21 03:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74b954c43bb22e49e5d65d61e431296 SHA-1: 2977100c02e1186b6787404194b98d2ab8ced3e3 SHA-256: 66bcee444a4ad7df3ac9a07f33c0d05210a17337c979d5aeb615efc06cebebab
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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'abstract drawings', directing users to a suspicious URL.

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://jacksth.ru/wix?keyword=dibujos+abstractos+a+lapiz
    • http://vuzosemeve.22web.org/arjun_r_meda_narmada_cancel_song.pdf
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/2304090.pdf
    • http://migazezi.iblogger.org/texesubunikubofev.pdf
    • http://letilemugemin.66ghz.com/dulixul.pdf
    • http://kovokowem.iblogger.org/jatowa.pdf
    • http://xamipofu.22web.org/ritosoker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fosixokosed.rf.gd/linak_la36_datasheet.pdf
    • https://s3.amazonaws.com/lokijuronig/boy_audio_songs_naa_songs.pdf
    • http://popipivajusev.epizy.com/navomewabep.pdf
    • http://mosararivifu.rf.gd/82834198744.pdf
    • http://jamosafiseb.rf.gd/menafox.pdf
    • https://s3.amazonaws.com/kiwopusafize/fozikirutopovufe.pdf
    • https://s3.amazonaws.com/vatosolikijike/higher_human_biology_questions_and_answers.pdf
    • http://konevimojo.epizy.com/gopodedapijejozu.pdf
    • https://s3.amazonaws.com/lezerawe/idm_crack_serial_key.pdf
    • http://roxutudutupit.epizy.com/qumica_inorgnica_peter_atkins.pdf
    • https://s3.amazonaws.com/xelimewat/52862878391.pdf
    • https://s3.amazonaws.com/saziwijaxodav/capitulo_2b_practice_workbook_2b-_2_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db87.bin
d7e6f65e9cc6379ddccb36ac7fedd802da5297eb44e11c8f86eaf48ed45791c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 5192 bytes
font_01_sfnt_off0000ed48.bin
b3c0ef9f773e48219f95e51b9f4af68508ecbdd239b4915cd236d30cf6317f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 11092 bytes

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