Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0b2f2060d65346…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 02:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ce656a563965d90510819111cf2715f SHA-1: 257693df082e6cfc42fb5ebf2c0523e1568a0c18 SHA-256: bc0b2f2060d65346fc21f73a4acd48006ab51cde5a4cb1adf4c89e999a4c006b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and heuristics point to a spearphishing attachment used to deliver a payload via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://osingenieria.com/images/admin/file/wuwakibozubu.pdf
    • http://razzledazzleevents.in/userfiles/file/ligijixubutazokadibov.pdf
    • https://manorhair.com/uploads/files/202109040949169622.pdf
    • http://sevenseahotel.com/uploads/images/files/80726436250.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/20e866396b29ab975eed394316d4d226/65039668902.pdf
    • https://my-natural-style.net/upload/files/18098438919.pdf
    • http://poslovniimenik.net/firme_data/files/97438598782.pdf
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jemizoro.pdf
    • http://studiofantino.it/userfiles/files/koserod.pdf
    • http://poddertradingandindustries.com/userfiles/file/42963577864.pdf
    • http://ellenia3.eu/userfiles/files/26457945520.pdf
    • http://snft.ro/media/file/pabafilobufewano.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f937ac1---16132237122.pdf
    • http://satakantaresort.com/user_img/files/43158453406.pdf
    • https://ever-progress.dacola.com/upload/files/82629692685.pdf
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/69908128784.pdf
    • http://hfnhsw.com/upload/files/33148223503.pdf
    • http://angarakshaksecurity.com/userfiles/file/14370232889.pdf
    • http://esangsok.com/upfile/files/39683657503.pdf
    • http://startent.ru/SITE/files/editor/file/71995622302.pdf
    • http://relaxzenter.com/uploads/files/vesekewesabevode.pdf
    • https://nikosdimos.gr/userfiles/file/47051853191.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/xubofudininipurugerikop.pdf
    • http://aylabawadi.ae/userfiles/file/35282803680.pdf
    • https://resulgame.com/calisma2/files/uploads/61778979231.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+android+services+library
    • https://easyown.ddproperty.com/datas/files/30231146342.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_off0000d321.bin
76e6edc4c662d9c590e7704939c88626f55ff26d8947876307d9eab35054c7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 10780 bytes
font_01_sfnt_off0000ebed.bin
6da9711a541553d69a50a4b34faf7f766565e746fa84e37749cd3ff39acc09c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 17052 bytes
font_02_sfnt_off0001189d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 16792 bytes

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