Malicious PDF — malware analysis report

Static analysis result for SHA-256 6358961ba88c42c4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 17:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2a0e35a764b938a1f59bcbc29d808e79 SHA-1: e9435d41efee44cd378e26e168ba5874d985fba3 SHA-256: 6358961ba88c42c44cb81c84d606c6a33b933576ed40158dc9398b36367cca2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for initiating malicious actions within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a network of links pointing to numerous other PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/64182566879.pdf In PDF document text
    • http://chothuethietbi.info/img/files/maberibezemorupeviwuzex.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/49448978381.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/bufobagifodeg.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/koneguvap.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/zawavaxiginajafelomefoz.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fudenofepevenudaw.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/06/12612003050.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/pugosimujama.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///folux.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/80367618006.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/mejonanuw.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/21757288457.pdfIn PDF document text
    • https://webhosting4.net/media/file/pivosujopevamofedotus.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/39226187980.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/nibufotevurupuzavu.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/wuvokeririruxaro.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/9746364913.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_2CBB9545DE4E6C2E.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/53910510499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=restart+smartphone+without+power+buttonPDF 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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 10840 bytes
SHA-256: 79bd6e9911a24aeed782a896fb02570d03af05c367cc97da8212f7a9c22c698e
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 18268 bytes
SHA-256: 45cea937737f64dfb1eb7113c823df5cdf1c46d7afb68bef043296905accf048

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