Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0967c1674d33746…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 08:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9430d261353e44b6a194c88bfcda757 SHA-1: d1022be363ecd82b84a9811a27191c2684e0f3f4 SHA-256: a0967c1674d3374621898886556d43bb3c9c1508d7585e6873666492d57c0675
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. The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The 'wkhtmltopdf' authoring application and the presence of embedded font streams are common in malformed PDFs used for exploits or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=will+chromecast+work+with+android+phone PDF link annotation
    • http://travelshops.pl/userfiles/file/bulalinexipimoxokejesuwul.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/56453007592.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/41205880869.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/gemasotuboboti.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac41911bb---12213732958.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/mobefoxitikolemafuwaxita.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353e3e1ba04---liwomubagogibam.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/fukibofewixi.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/30496815619.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/63304909465.pdfIn PDF document text
    • http://goref.ru/files/file/wijoxunutidekafuvipavu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/14048451274.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/wadodenotodekanunujuse.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/tapukapovib.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/78923138778.pdfIn PDF document text
    • http://didula.ru/img/file/12303088644.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/20780037877.pdfIn PDF document text
    • https://tebra.si/userfiles/file/53078573360.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/xiwolij.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210913_0C78EBF38C97EB72.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/83329671904.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/lebusifo.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/gifivipujumefesefumakusa.pdfIn PDF document text
    • http://elpijisystem.com/file/84785161775.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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 17468 bytes
SHA-256: 854ac1dfb138482a2c04d0e02ced321f19efacea1325acf2eed12983e1f49b00
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 10948 bytes
SHA-256: 5eaa4c9d256c876523c931c8b38fed2b36e75aa46229fb292910514c057dbbbc
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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