Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85c8b8c65e8f5a7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 18:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0778015516273a98217580a5e46ee6fc SHA-1: 3844d1423b157e8406c907703278d1831c312b26 SHA-256: a85c8b8c65e8f5a7114e519d5a421a618737ae5a475c74dec48310b5a4d0a593
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://toszegisuli.hu/userfiles/file/45961992128.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/41443326469.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/sawepobirixerad.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/51554167010.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161380d520b992---pipefudulesewosexafe.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/48230644219.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/36481519599.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/jidukowozexawazobefubus.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/33762627589.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/78309250158.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/10098876213.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/69225428743.pdfIn PDF document text
    • http://mutitar.com/user_img/files/18890779617.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/73522960268.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/87608827375.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/14843114279.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sovitujumimemetikisafa.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/labudonobov.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/42121403325.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/wigibax.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tatasakegeweduxizuwu.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zalazagawabokod.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6eadf717---96866023830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=boku+no+hero+academia+season+5+episode+3PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 17456 bytes
SHA-256: f51fc5b191c7ecd91feb6608e9f2f32ff923b30275ceefcae57973c1311b6d07
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 11184 bytes
SHA-256: 081d3d14477d436fadc77dd341170d653a0d6e474f8202450d8e5d70c6fc4638

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