Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850000ee2262fdd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 23:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96739c1e9fa8f1214b94723cf027b811 SHA-1: 363a923c941768785f9c206b5a8a49180e446e5b SHA-256: 6850000ee2262fdd50a5d56e3048218b6560012c65ba53c434ee0570709d5dc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=schaum%27s+biochemistry+pdf PDF link annotation
    • https://aspaeng.com/files/image/files/benuduzagejilabudon.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/60326183960.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/gatumusaz.pdfIn PDF document text
    • https://badrivishal.com/media/76964165005.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/16560375361.pdfIn PDF document text
    • https://equalland.com/uploads/File/4909045657.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/kavurikifetotebugezota.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/nugatajijub.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/nojodakodefige.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/vufesos.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/fee34a8699c1254be9e19b024e97d6b5/nesadamezanugariroxitoni.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/28232317331.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210903143007.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/ninadakufipudufutogedubeb.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/navebokipozige.pdfIn PDF document text
    • http://laduses.nl/image/file/53147925512.pdfIn PDF document text
    • http://gestioniarmatoriali.it/54822482777.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/67763187063.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/tirawurotavuke.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///22396847940.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/74574265485.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8ef4df75---mewawenisixafudoxakemuxo.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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 16516 bytes
SHA-256: 60f5831af959d396ba9e0bbb0953a1dbb05d8c4f3d6f24e06df36c9d6c879a4c
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 11200 bytes
SHA-256: 3cbc7f193009ef0c6d94be77089e49edbddc67c20b6d2cd7cd4a79fe1c7fee30
font_02_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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