Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba461ba34a346243…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 03:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42fba2cc3cd9eed944b9083d9196b1f8 SHA-1: 6d92c72d16c97e0fc80575d2076b3c3924b60820 SHA-256: ba461ba34a346243c4d45fd925c6e8c6c67f98b6110b35d80654d98dc45785ef
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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.
  • 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 https://mp2020.csysadmin.com/ckfinder/userfiles/files/198155699.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/29758635797.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecc2cc77ed---85310465667.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/44360528241.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/95ce6fb2fbd2520102a25b226b7ced49/jofinozavepulezurobek.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/32043612936.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_2AF3FF4D93B68832.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/gowemunavinokavowojupu.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/80425483310.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/legedipuzesibo.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/banonik.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/40633244405.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/66750400406.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/67590360971.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/60768636450.pdfIn PDF document text
    • http://alkanboya.com/files/file///19364207739.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/53865755596.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/38301372648.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/5589083753.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109100406558651.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fironavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cara+scan+qr+iphonePDF 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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 17420 bytes
SHA-256: 8281a50b4305f5d988c2da328748b2a767fa7dbeab9a6e136889da5afebb134c
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 10504 bytes
SHA-256: 7ded8e109bb68369714f8f4c4f0d80563e2d4fe86c6b0d46182125c139857fa7

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