Malicious PDF — malware analysis report

Static analysis result for SHA-256 11879cef37fd7fe8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 09:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8efddece974277ceb1dd12f2da665d68 SHA-1: 7a4415a79c8744d7774c991f752d92a0db3c986f SHA-256: 11879cef37fd7fe8ea8a6907ba643e12c86a82aab8a4e8f19dced48fdef7787d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and points to a raw IP address, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to redirect users to a harmful payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://211.129.1.225/system/ckfinder/userfiles/files/kukujumefijunipixar.pdf PDF link annotation
    • http://tinhdauvietnam.vn/upload/files/82255433836.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/jaxoxalaj.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/35061691854.pdfIn PDF document text
    • http://mcutech.net/files/pijinedonetejonetuxexa.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/31071970864.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/ganoge.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/44572673745.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/xikiruramujuzivozineriwo.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/72231685355.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161440f6a15153---14693176472.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d0725e93284f2919954e3496bf4f8bf2/musakewuwatesupe.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/66718155744.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/46940320722.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/44347217882.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/67223276979.pdfIn PDF document text
    • http://ty-int.com/files/files/9393612745.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/44101668458.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/vozafikosemufopu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/6070325282.pdfIn PDF document text
    • http://arucax.am/user_images/file/32904000286.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/18483338910.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/davefenipebojawusiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=phone+app+hiderPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 17220 bytes
SHA-256: 1e221b08f7112b0c59c47576c69ef01748f4f5b4a79f7102974eb2d667ac65ae
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10180 bytes
SHA-256: 75fca578bc7f8cb7760513d2df1cc7a73aef827a0551db78f439cad261e59059
font_02_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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