Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbea56a11de1ca5…

MALICIOUS

PDF

71.9 KB Created: 2021-10-02 19:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea61084550d4b2de8324fce27eff8afd SHA-1: fb8d2e61cbdd856e2f0d49e269956baab4dbbede SHA-256: fbbea56a11de1ca5f5ceeddf6237f626530c067bee1026b739c6f1e06e6e3cd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

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://laborke.ru/uplcv?utm_term=how+much+does+it+cost+to+fix+an+engine+mount PDF link annotation
    • http://styrexon.cz/userfiles/file/dijowelire.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/jedar.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zujezude.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/8810220631.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fuwafunekamonujulodexo.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jedozuxijogaluberowu.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/tamigir.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/54163535044.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/50286697550.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/78600407395.pdfIn PDF document text
    • https://digireg.es/upload/58783482622.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/93115686876.pdfIn PDF document text
    • http://sung1.com/upload/files/fibumodunatewawofekol.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/6842158866134f9d699d15.pdfIn PDF document text
    • http://oilspecchem.com/files/41340255030.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/tasejejigarenakeb.pdfIn PDF document text
    • http://irinabailey.com/upload/files/86359837481.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161544ddc853ad---likotonufaxonudapomaxulo.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091223474873499.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/16192595042.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146652f5b8b4---10078788914.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_off0000b333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 11056 bytes
SHA-256: 371870f46946ee87a71e5bb63e362c5e03eca6ecb9bfd6a9caf134d31f4a89a5
font_01_sfnt_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 17544 bytes
SHA-256: ab0b9038e6b271d5a8715ce0365bce421f55b0eedc2ded591bef24655479bd07
font_02_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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