Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c32149d4f1fe52b…

MALICIOUS

PDF

85.3 KB Created: 2021-10-07 20:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 220835a8cc89799dfc0ba8d3593b89ed SHA-1: 4c9c9cd0f7fe1def1d85457e114b9c1bb42d1b60 SHA-256: 7c32149d4f1fe52b64c9e118735ca72a3cde31a8d2e4ddb75d17ae5d18db568a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns suggest a common technique for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://indagosrl.it/userfiles/files/tujisubivuvu.pdf In PDF document text
    • http://awarelaxcentrum.cz/user_files/file/47306598040.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/45443177332.pdfIn PDF document text
    • http://boldogelet.hu/media/lokulogodagutogi.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/58825690505.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210907052650_1740378330.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/rozosogomuxivoler.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/85069046393.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jusojuxubinuwopu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/mikemilofomukes.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/8708557451.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26311238839.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/11371965881.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148622db35c7---tuwebonekubodekataluloj.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/47732361697.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/75579127658.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/vopuposoxibowasode.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021092011294273499.pdfIn PDF document text
    • https://wita.lt/images/files/15320388073.pdfIn PDF document text
    • http://sbkf.org/files/files/venodasa.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/furuvisereku.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/45240616614.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/domupoloxozina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=peter+from+lion+witch+and+the+wardrobePDF 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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10800 bytes
SHA-256: 8b528656269307edd6d5fe46e0a6d3b1e4d1df23d99b803c9b9c3a45a52ab6c0
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 19096 bytes
SHA-256: b6de334c09117376c8a2ba66032adf1e7debac37eeac549de839378cb089cbb8
font_02_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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