Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b63e7f5f6488fa2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 22:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25c5fa40ae79c43f1029c697b710732b SHA-1: 1c40794f945fdf7aa66990f1a6c519a502fbb4f9 SHA-256: 6b63e7f5f6488fa299be1c5f1922b48937ed622a7b10e132710b933122563ae0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded links pointing to various domains, indicating a link farm or phishing lure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://hausdergesundheit.net/userfiles/files/23775855583.pdf In PDF document text
    • https://edouardweil.com/userfiles/file/davup.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/sixotekilemuratadebej.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/vemerer.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/putak.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/dorokisozen.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/27609345022.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/jimazalitedoni.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/vujokukor.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/77912497987.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/bovelitafaka.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/69396172853.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pumokesarozudi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/06a6e9717a4a9adf8cf9f0176067db87/jajunovozib.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/nojojibumu.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/labeli.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/18190348928.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/suvovekaxokanejiga.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbb966121---99962753055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=main+hoon+na+movie+watch+onlinePDF 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_off0000ac1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1B 17152 bytes
SHA-256: ff1b206a48e4b735da7fb87644b696d7d8c777302a155ff35f2453e43ff7a0b4
font_01_sfnt_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 10372 bytes
SHA-256: 308f3b8b21251a7e26af674183db59161312449ccdd7f6c9ac7da102193f9399

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