Malicious PDF — malware analysis report

Static analysis result for SHA-256 529d3659e1136762…

MALICIOUS

PDF

91.3 KB Created: 2021-09-14 01:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8b3478f5b8dd918e995757375debfdf SHA-1: e71015e940011690abe20f78b4926dc9a881c96b SHA-256: 529d3659e113676226d97bf95646ab9bb782c7dc79e02792ab7cd7efdac62f56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or redirection mechanism to a malicious site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://df-2.de/images/daten/file/25970976171.pdf In PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/85437584677.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/89547424431.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/xulokefepudup.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/muradikemafuvadix.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/67336763068.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/vajodanutexurarevujotof.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/pagesufakiwaguka.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/xuxaxozobegitisajiporide.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/93718396548.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/puxataruwalonin.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/58182014921.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109132258178135.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-7/20210907090427835075.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/97923188363.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/2292734078.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/34000239136.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906031554.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/zivosubedadogaxogitinek.pdfIn PDF document text
    • https://digireg.ru/upload/86742901887.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/81644380738.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/maluzesujekofakugekuraku.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cadb79e02f---87933778421.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/34780632905.pdfIn PDF document text
    • http://irths.com/upload_files/files/dosim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=connect+webcam+to+android+tvPDF 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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 17404 bytes
SHA-256: 0b4390bb2668b9ad4089e6824cdf0cfbef48743ffc845ee70cdc483feccd003a
font_01_sfnt_off00012f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 10640 bytes
SHA-256: 281b7622ef6920eced6a297eb3a63d5a60293a595e4fa04b430cf0f9290208a3
font_02_sfnt_off00014776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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