Malicious PDF — malware analysis report

Static analysis result for SHA-256 968e72090c37a342…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 23:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f40fdce0f82bef991e41632f7674cf48 SHA-1: 1660e9f61112ebd50aa03ac793ffd6aba02af101 SHA-256: 968e72090c37a3428a8dcabe7fee4b3dd0b606399f1449548a2802b585cc72f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics point towards leveraging embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=quantum+information+theory+lecture+notes PDF link annotation
    • http://e-sportis.com/images/upload/zivelafuwezule.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/11365023114.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/51573284135.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gesamix.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wedifakujiravorakej.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/20690381644.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/kavusagakakexepije.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/wibifuka.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wumokutumeti.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207e8ce3b9---78348427931.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/sevogoves.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/wubiponikufeperutu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433bfd6523e---vesejegum.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/vulegofiruvebudik.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tesumomo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/74522090981.pdfIn PDF document text
    • http://fygl.net/uploads/file/011632286867.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/12329419468.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/6698735935.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/dumikakur.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/zevabamezijewudat.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/viparupuzod.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/tamenalemofasoj.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 17788 bytes
SHA-256: 1e65c046db7d2374584cadbf0557fbf62c2f9a3963a578a7fd975013aa0f12d5
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10876 bytes
SHA-256: 7d91e330b4a2553ad6ae5f6509f984c8127ccf3548735eed09cfc2fa98a32770
font_02_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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