Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b80a08005a053a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 14:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce342e442f82ff79e3884725ad687dac SHA-1: 668e9d84e0265240703faea1a8f7c24fe261845a SHA-256: f7b80a08005a053a36029c48c12b66c59c5d7f796f6ad7c543879c1ec696a0f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support this assessment, indicating a high probability of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://ketchas.ru/uplcv?utm_term=avengers+2012+movie+online
    • https://lbk-ingatlan.hu/uploads/file/xoxiwafi.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/nizuziwiwokefiwa.pdf
    • http://tradotel-riviera.com/file/fuzesepijovu.pdf
    • https://ncvpte.in/userfiles/file/zanixa.pdf
    • http://congtrinhnhaviet.vn/upload/files/dijijanugumusipezeravob.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62271030155.pdf
    • http://platcometals.com/images/file/94068854512.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210913015605.pdf
    • http://copy-office.it/userfiles/file/29267394458.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b26d144ee2f36d5270e859d3a146043f/mefufanobiwafana.pdf
    • http://sipzip.com/userfiles/file/savuzidunonogefefa.pdf
    • http://vibrobeton.by/pics/files/54316283783.pdf
    • http://rpsbchamber.org/editorData/file/10837177396.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/zaxeziwu.pdf
    • http://pphjako.pl/userfiles/file/92509203794.pdf
    • https://shirbandifelt.com/userfiles/file/54573619715.pdf
    • https://rabudiagnostic.com/userfiles/files/sulebikavow.pdf
    • http://seanmore.com/userData/board/file/88825576530.pdf
    • https://hoangnhataudio.vn/media/files/93530080366.pdf
    • http://status-go.net/gfx/userfiles/files/84413299437.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/relodize.pdf
    • https://camgloberealtor.com/userfiles/file/84686051958.pdf
    • https://graveyards-fuj.ae/userfiles/files/rijevovoxuwonaniwa.pdf
    • http://aromata.ru/upload/files/12221168962.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 16792 bytes
font_01_sfnt_off0000d1c5.bin
527d4d01a9c9226b4a6b6bff282c55d2cfa7bf87ebc81648271fd190ce95a118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 10532 bytes
font_02_sfnt_off0000e9d4.bin
07e6ef2fc47677686bad4507fbcd5167e1cb887c68cb608201ba666bf64f2a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 17556 bytes

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