Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8fb77c0ba147d8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 02:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2cd4ab3133410d5bc2099e24e846f71 SHA-1: e4ac06771a7be748ce73b2e057696a3d9a4210fa SHA-256: 7c8fb77c0ba147d8be9ee17fc3d2fe5c90d0f8137a6bd31babaeb62f398cfc03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a specific ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and acting as a link farm, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=manejar+movil+android+desde+pc PDF link annotation
    • http://zehanbiopharma.com/upload/files/tegopapef.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/65074605535.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/77108105634.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efdd74c2b5---tujitawafixob.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/toririzazudiferebetu.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/gonunovijapokajoranufuneb.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/najopagaxebeliz.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/61791649300.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tovutako.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/19015209873.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210903030604.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/1753293697.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/gokon.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/18978872591.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xesamixibijevup.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3248faee---verewowisajekexebeku.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/kakedise.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/kugetunigowetixogetokepa.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/69031866402.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/zafamozolexugubo.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/89971990550.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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 19456 bytes
SHA-256: be3fd35d935e0f247f9c68933cf846aafc54e87f50d4ffd601b5b2fb22ac6452
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10764 bytes
SHA-256: b26e11d9060a860809ee37046aedf4d75f8aacd7ae0649a81ba9e31a4b6b67f7

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