Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9501fb809f16a5b…

MALICIOUS

PDF

88.9 KB Created: 2021-10-08 23:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbf9cdcd374c9c9b064491c38c2fbaeb SHA-1: 1e94968484ea8521a11340802c231cd8c7ccf47e SHA-256: f9501fb809f16a5bc54d71910163b9efea78accd4d6b759e1a4838d02a27d01c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or redirection mechanism. The PDF structure and the presence of external URIs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=the+haves+and+the+have+nots+katheryn PDF link annotation
    • https://trompis-tondschungel.de/userfiles/file/52150099158.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/12627764902.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/36817285531.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/48292703051.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/47675400685.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/89223260121.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/69292566796.pdfIn PDF document text
    • https://maisonforville.be/documents/file/9052438235.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/81121219331.pdfIn PDF document text
    • https://naves.cz/res/file/39580792159.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/86378253792.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/82160340375.pdfIn PDF document text
    • https://digicpictures.com/downloads/47738286783.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/42441685507.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/49213216176.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/fuwubawejesuguwif.pdfIn PDF document text
    • https://hyper.vessty.com/_img/files/kiwanuvulu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/tezegisifuzonal.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/76732461747.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/tusolunasisofexik.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/93853079979.pdfIn PDF document text
    • 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_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10440 bytes
SHA-256: 633a4d4e772e570f122e6912e432685d9d4cf6340be6e52934fac5b10ae1c678
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 20308 bytes
SHA-256: 6978048844259a031c8253beee8567f563001dd4ffb069f87cd783c548ad440b
font_02_sfnt_off00013e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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