Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bb25e55b16f109…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 07:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b12c25c8a28c1e6401923aa5543c17b SHA-1: 50d763ef94a5d1fdb8f03fe0b3eab67b374cd5af SHA-256: b0bb25e55b16f1095787175487496587c2e426261285e2fd57b87c0da5fc4d1d
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for containing a link farm on disposable hosting, suggesting a phishing or scam operation. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ikkosushi.com/uploads/files/3201328141.pdf In PDF document text
    • https://asi-filter.pl/files/file/70780284102.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/50793226548.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/48968581334.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808d9859dc---suvirawujifubekokuni.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb628eea83---84564895373.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/6647842379.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109011651451651.pdfIn PDF document text
    • http://okun.su/upload/file/19897082768.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/7155559159.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/4708268107.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/83283608070.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/20480251263.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///75857350190.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/dilefedokevenoxi.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/miximujozijesirag.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/23917599231.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/migepumiwejalalivisi.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fopupeguvitasogi.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/25785846761.pdfIn PDF document text
    • http://apicn.net/upload/files/vixivaxizeg.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/26545250789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+beyblade+qr+codes+2020PDF 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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 10860 bytes
SHA-256: 607ff1be5aac745911cfe3eb5a2d7f05df908591f6b79df3d8c0a13be80d9569
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 17744 bytes
SHA-256: 3298109ccfe3b31a867c181632c5ed4a1d71c8e9d961c419ea0077216aa6a81d