Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d9285fea70797e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 04:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de784a46b1162561a572b2b5d6cf1bcc SHA-1: c4bdf900a55778bfb7114e87a411d1db9b7747b5 SHA-256: f1d9285fea70797e14db494461f629ee4ad8b274a9a61d46537847710a874853
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. It functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains. The presence of a link farm suggests an attempt to obscure the ultimate destination or to distribute multiple malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://av72-reklama.ru/userfiles/file/163073596915a2c2fe6d12bdc21e16.pdf In PDF document text
    • http://shippingengineering.com/files/ckeditorothers/gonufodesefekazufex.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/pogitubuvuxobafebagadulu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613143b235245---39540561486.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/badovejojifew.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/tumadupomas.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916043231524531.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/91631437246.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wovaju.pdfIn PDF document text
    • http://naso10.com/userData/board/file/lekudibijixune.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/bofizi.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/71121235819.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/39012073493.pdfIn PDF document text
    • https://yodobashi-church.com/tubitipofipetipudameseji.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/budoxevabuseralimojola.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/ridanadozuvivusular.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac32d87079---63561835217.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/88916772917.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/vutojuzibesuri.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/33769030258.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/fererodupob.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/fizovukeb.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/17455782462.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tavagaxuvusejugomaxewagek.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-17/20210917084852439020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+app+to+download+gta+5PDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10648 bytes
SHA-256: 5c5c0e82f9352e6284f31c8a514f1491fe08a128ab560dd3ea3c86e26e4a7c52
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 18464 bytes
SHA-256: c24daf0855038b2bd8597bc66571ceb840a43fd28b18e4a4472d76a2491ac4c8