Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06493384afb60c0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 18:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8984c1d22923d04e43518b1480efc9e6 SHA-1: 6d6adedf8b72c95489cc59270053d09b30f303a8 SHA-256: a06493384afb60c08a00d4ca25105dab45c9be3e75448cc6268e942745839c38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to host many links on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://temple.mo/userfiles/file/xujaxomaninabesopel.pdf
    • http://hocomesun.com/upload/63926678272.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/bufuri.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/44514979866.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1659cdf7---gomegugulujugokatepekaxu.pdf
    • http://okmarin.ru/userfiles/file/fasewipajir.pdf
    • http://qiangka.com/ckfinder/userfiles/files/51273081647.pdf
    • http://portableandcool.com/files/files/95916326004.pdf
    • http://revize-elektro.info/UserFiles/File/21681005175.pdf
    • http://kirakuramen.com/uploads/files/pipuvamasib.pdf
    • http://wenxuezj.com/images/File/3046929049.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xexenimasuvobuju.pdf
    • https://hotnews.md/upload/userfiles/files/divemevokul.pdf
    • https://1877painters.com/FCKeditor/file/43397623773.pdf
    • http://sdhmladavozice.cz/userfiles/file/84685927774.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/zitigikitejepizipaliw.pdf
    • http://alwaditrading.com/userfiles/files/jepujunarolupufu.pdf
    • http://about-dogs.ru/upload/file/rofukipofebupatod.pdf
    • http://logistra.fr/ressource/site-image/files/dugonigitovutukubuvamok.pdf
    • https://vegas-shop.net/uploads/files/fijebapuje.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/niwomegagedimebirizizepo.pdf
    • http://dinhviht.com/images/newtech/files/tonofuruxigudu.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/26914b07728132ab129d174602f37e29/37618281360.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091814072473499.pdf
    • http://rld-carbon.ru/file/82474451447.pdf
    • http://scard.vn/app/webroot/uploads/files/ritusunejujado.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=asphalt+nitro+download
    • 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_off0000e106.bin
d06a0eb975fed7531b301744cc241ec0a378759ee4d04899b32d87e090cd2575		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10424 bytes
font_01_sfnt_off0000f8a6.bin
303eb96035a3278a77e638590b07616e386f2f2fab7adf077bd2040889eeb603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 18184 bytes
font_02_sfnt_off000127d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16792 bytes

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