Malicious PDF — malware analysis report

Static analysis result for SHA-256 79361becaf16b86a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 15:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3644271a541be091958b2eb4017a915b SHA-1: 6d44a9f1841de675b973783b812e1e2372472552 SHA-256: 79361becaf16b86a60cc148a310eeda9652bb9fbdc74d177bd7faf81c6b7edbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://congnghieptauthuyvietnam.vn/upload/files/buzifojuranita.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834699ab0c---68503427000.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/90618314150.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/4892986978.pdfIn PDF document text
    • https://hirurgija.me/files/17858851583.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/geneperugarimovegoze.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/sabadelavunegejerugunam.pdfIn PDF document text
    • https://quizai.com/uploads/files/42228596596.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lalolexumexopidusu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/texusekugewetilosunuxa.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/48812599144.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/lubow.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910181659.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/fazixezavegaxateguz.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wuvivemidupixadimutamud.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/80801657195.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kagewujuragudetizomamos.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/2021364805.pdfIn PDF document text
    • https://gencatakan.com/upload/file/sazutisezizaf.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/sigozup.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/lelebutofo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/sonatokaseporozo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6a605f46d7fd5e541e033c909680b72c/jinonawakogilun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=miui+camera+latest+versionPDF 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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 17940 bytes
SHA-256: 0fccd9238ede74a82b5874b167565bb04fe3dde4cb06d68f38cf14d883d3e0f7
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10552 bytes
SHA-256: e5635e3e428de096ba60e5a092a0e224298af541e04d574bde4356faffd612d2
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1