Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d64b77f9e5766a…

MALICIOUS

PDF

72.9 KB Created: 2021-03-29 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f89f4b23fccbebde88c9f7f0f1690add SHA-1: ebc82e4ffc35c82377da65c2518208b83f55711d SHA-256: 13d64b77f9e5766a0ac249ee3a3cc8bd9a9d7710130a6cba5974aa81ebb52b08
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 hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=orthographe+ce1+bordas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493579/normal_604b57906a084.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/xajazipekef.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/nonapuse-wopefexikil-xerim.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/hbgjbRJ/tutewu.pdfIn PDF document text
    • https://faxovidovatage.weebly.com/uploads/1/3/4/3/134378957/rajurej-raziwatubizunoz-lepotoki-kutul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff0732538536.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/f3Mzshg/lupewovisonelike.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/iighgcS/tiroluxemimuwupadepud.pdfIn PDF document text
    • https://bafosuronam.weebly.com/uploads/1/3/0/7/130738527/nudejunejesemikuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/fBlyJXk/electronic_drum_set_amazon_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/Q1oiiKj/19153342666.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/balilureloge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_4921e5c9c5ef4bbeb3586a5b61ab56bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/blockchain_based_news_platform.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_4ee6fea65cda43e7b588450f28e2c050.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/how_to_write_a_bad_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/samsung_s5_active_t_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/32957512385.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_9a8e95f4cd3c4053af23d5c8d72bacd6.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_1bfff9f7518f44efa97fdac8cfec9512.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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 5604 bytes
SHA-256: c775ffbb84f6926ea2664e179e66e1838c79f918cafb236e553c18e89546b747
font_01_sfnt_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 12828 bytes
SHA-256: 4247706ce7c9950f1be1d5b8f3a5ba41933ce8e755ac2f1078855530fba7c85c