Malicious PDF — malware analysis report

Static analysis result for SHA-256 932917b087f0d472…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fb1daadec186de5305a39caca04020e8 SHA-1: 06fe858585bf909a48296974b878276cb8b3322a SHA-256: 932917b087f0d47287b847658a6fc359246597feffcad158ee1a117313e2e672
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains hosting other PDF files, indicating a link farm or distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://brmhn.com/userfiles/file/20210913064347_0gnyoj.pdf In PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090111151670554.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/sozoloxarudiwudosugeze.pdfIn PDF document text
    • https://mcsfood.com/images/file/54390958698.pdfIn PDF document text
    • http://bjjiffy.com/upload/71382144279.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/87537926041.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pudoveb.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/bidunebevaj.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/37711959041.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/15109680428.pdfIn PDF document text
    • http://inica.org/files/file///7245115415.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/26416052399.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/89274525580.pdfIn PDF document text
    • https://airbays.com/userfiles/file/14061098566.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/pitupagawubolekeko.pdfIn PDF document text
    • http://autodilygood.cz/files/file/jipojadawozerimexup.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/90322571060.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210903_58F32AF5D8F58CA4.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/33223323566.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/21771342372.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/96559530635.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210911051820.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/pisobipiz.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/bedexoriden.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc916ab347---49643299734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=christmas+ringtones+for+androidPDF 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_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10788 bytes
SHA-256: c3d51cd6c51b8405ecf3dcaa8494e49c7c150f4688fb57111b5ca07308e5d0ec
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 17704 bytes
SHA-256: 17200f72deb270135e079b731ef6243a422529066f9f1ea503af0455d2c2c70c
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1