Malicious PDF — malware analysis report

Static analysis result for SHA-256 3494ee3eb8fadee3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 15:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cae6a15f823da917d9f7ea47460b8cb SHA-1: 4c4c286ed660b30141845d8b4c9ec28be7b975d7 SHA-256: 3494ee3eb8fadee3fac96c93e08c4c47c0d82beabfa47cc8782852a5b56f319b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This behaviour, combined with the 'Pdf.Phishing.Trojan' ClamAV detection and ML classifier output, strongly suggests a phishing or malware distribution attempt. The file's structure and content indicate it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=translate+website+to+english+online PDF link annotation
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f49qlrlqag27lu9e3u4dc969po/kabevejabogoju.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/89797047843.pdfIn PDF document text
    • https://activepymes.com/pub/file/josiwimogabemapetif.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/13817727064.pdfIn PDF document text
    • https://bnovum.hu/downloads/tibujibele.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/feronowom.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/82842614992.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • http://centromp.it/userfiles/files/25907752526.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/57231726942.pdfIn PDF document text
    • https://windsbs.biz/files/file/54701476436.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rapefoxukebibuwatul.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/segekedumukoguvov.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/8620930960.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/68808686002.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/182109345.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/nasezazalarofipivinoni.pdfIn PDF document text
    • http://surestegc.org/documentos/file/59453887924.pdfIn PDF document text
    • http://ewtch.com/upload/files/zovub.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/solevimufutexowuvesuku.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466fd612953---nuwasujikugebiburikiduvad.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/xarefapewanemug.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/favuzeteropamagubutoj.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/lotefes.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/33495805836.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
stream_004_off0000f32a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF32A 10576 bytes
SHA-256: fa119f13327efffac040b04e107893d545b8ac22b42e3fc998fa0c10b3d5c25b
font_00_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16384 bytes
SHA-256: 7ebd2d93f5bb4424c602ca5a88cda2682815738808421c8f4a74a5765fa5ed4d

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