Malicious PDF — malware analysis report

Static analysis result for SHA-256 500f4a535d2ad4c8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 17:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee43ae0d1b906036ce046ecec3b54cd5 SHA-1: 5dcfa24a06203d3fb2694a07fc1466c975ffe06c SHA-256: 500f4a535d2ad4c8ec36bd68767fda8d550b4ba7b4cab118498dd6f9f02c357a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable or suspicious domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, suggesting the document's purpose is to distribute malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://currenwatch.myhost360.cn/file/upload/files/09-02-10-57-04-28.pdf In PDF document text
    • https://al-wesam.com/userfiles/files/pisoxewedaga.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbbe70c946---kewexotijuxejuzivezedato.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/58836782650.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/xebomuvor.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210918181700.pdfIn PDF document text
    • http://upakuika.com/img/file/xiwadafakipezix.pdfIn PDF document text
    • https://luminex.pl/upload/file/zozinifesinogegi.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/burexenawosano.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/8935372131.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/8567172604.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/665bfbf24a47c059eee819872180dc01/wujusivo.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lebutijafubonoluseruj.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/temufanojibuzoni.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/naviza.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/67240985030.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/tevifux.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/70779885170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+fix+my+internet+connection+on+my+phonePDF 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_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 18072 bytes
SHA-256: 229dd78d770487fa5fe9434a0c7c876b053d82539001c9976db120fbeb7c0c56
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 10660 bytes
SHA-256: a6dc002db5fb98738cc9d300cff39c3de204de529ff6a8a540ae8fdeebc17b2c

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