Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b4dbaa8263e7c4…

MALICIOUS

PDF

74.1 KB Created: 2021-10-01 02:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3861ae42a68f15bed7bc852a496cb56b SHA-1: e5854e51a51ea4bfe77ad3ed6184125666f0677d SHA-256: c3b4dbaa8263e7c4bd5bef9fc655e6b70e2227cc5bac7f80e118d75f57bd312a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to potentially disposable hosting, and is flagged as a link farm. The presence of these links suggests the primary goal is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://soft-pro.hr/upload/datoteke/90282731999.pdf In PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/71493580972.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/70588792272.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/23039003325.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/75365120399.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f8cfbf32748e6329ffbcd8258c437ef0/gatifazuluxapuwasanav.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/87515008471.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/79441732589.pdfIn PDF document text
    • http://air-ned.com/uploads/files/tamugomoxifafabawowugejed.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/rubabevufanowokazer.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/sajadi.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/90272054363.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/dopavuzodetagumekuzino.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/fomekid.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/97667084300.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/nipamifutivatakubipu.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/71840058702.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/veserekatome.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/56423874076.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/suluxoligidukilarekeb.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/bosupinuxukuzifux.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/13669515467.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/4653763389.pdfIn PDF document text
    • https://faceless.me/userfiles/files/48473010872.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/durefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=papas+patisserie+gamePDF 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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 19424 bytes
SHA-256: cbe251df4b8cd8e423aa5b71435f19b7e1dc3d1a562e25d457c1d1820ed56028
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10328 bytes
SHA-256: 1cb2f58e4cda7024ba07d56f533db491dfa8603f16d1b62a1f7d7da53276ad21
font_02_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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