Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33dbc3e3b67b20e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-10 08:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74c7bab519d78f1f9d32f1d05245b9af SHA-1: 294db9ec136a26484f94415111598de074e4fa21 SHA-256: a33dbc3e3b67b20ea3fcb26e43190c095786049d8b8c9882172e8c4369926c92
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious content. The primary URL, https://botokaw.ru/aws, is presented with a query parameter suggesting a topic about figurative language, likely a lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan variant.

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-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://botokaw.ru/aws?utm_term=what+is+figurative+language+used+in+poetry
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/9764616.pdf
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6017b73370304.pdf
    • http://panedapupugaxe.22web.org/79838210260.pdf
    • https://xuwumiguxapizif.weebly.com/uploads/1/3/0/7/130739656/gowurud.pdf
    • https://dobuwejakunarek.weebly.com/uploads/1/3/4/7/134772316/4359869.pdf
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/vejenotame-dirijosureza-lapafumeziwot.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/dumazapezugu.pdf
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fe5fe7964053.pdf
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/3775182.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedatowuka.epizy.com/account_charge_off_on_credit_report.pdf
    • http://gonuvatujuj.epizy.com/1_to_100_square_root_table.pdf
    • https://s3.amazonaws.com/nademopor/69706976067.pdf
    • http://muvabeso.epizy.com/baldwin_filters_catalogue.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_bb05dfff3790444b95a647a3f325f2e0.pdf?index=true
    • https://s3.amazonaws.com/tufitijinexu/video_bony_mwaitege_sisi_sote.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_b9f81a98a22a4e86b305532270b2ee80.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f806.bin
003d12d86c155c4177d77480ae08e6a049237426ae5697d179cd7428d6238800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 5360 bytes
font_01_sfnt_off00010a4c.bin
d4a5b83a93db51e7167d7773e047a04d8b4dfe44976260608fed772342dc7d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11012 bytes
font_02_sfnt_off00012fbe.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 4324 bytes

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