Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbbb0ef46a8f2f6…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 11:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44e3f86680a969567603049f2504715c SHA-1: 2efe88ad5887668e1568fd212bd6ab2c00e38df1 SHA-256: bdbbb0ef46a8f2f6f0038b80a97dfd4095eb50001e2eaf1840c47beacb064984
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://apsons.eu/files/file/bosubelerilelekutavol.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/64013555189.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/dizijetovinisasevidafixe.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/61833203193.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/taledavur.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/26818051901.pdfIn PDF document text
    • http://kyea.org/imageuploads/68938976906.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/xoxemetogalutobuv.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614182e3bc284---wesunexelizafixuwasuv.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/96055379611.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/totedarudodokufuxazarasap.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/72628060246.pdfIn PDF document text
    • http://sbcnepal.com/images/file/2573774482.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/99268342602.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/39503640693.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/68029038972.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/28508150258.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/8669800160.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/mukega.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/volaxurebako.pdfIn PDF document text
    • http://evola.it/userfiles/files/20611041448.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46420266840.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f79ea7d4---77906396461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=send+file+from+pc+to+android+tvPDF 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_off0000ada0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA0 10752 bytes
SHA-256: e9875ffe3268d3399ceffd3078373e35f85c0626fc51a7295cbd43dbfe8e04b4
font_01_sfnt_off0000c65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 15536 bytes
SHA-256: e8a28f25dba6bc3370052e76f4dbb8b390eb85e037e84d14a3e5990308d4e806
font_02_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1