Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b657a6ec768a073…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 05:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ce695db256fbb14f17958c0a73443ae9 SHA-1: 805a68168dc703b17e1b9dec61f05221279e8387 SHA-256: 6b657a6ec768a073b887c70da756b7ff17e25bde8092846cad14b48a5ab2f972
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chip-chup.hu/upload/file/70635625452.pdf In PDF document text
    • http://archinfo.ru/uploads/file/51102098939.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/petazuribuzubupakoserude.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/29449050610.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xeremefal.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kefexogumegenovevuke.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/92317202321.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/17262406370.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/72853256776.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/8700968599.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/kixarerasef.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/lofanomos.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rmj3bbqk0v53nlnpbjs4o1hs15/51891961417.pdfIn PDF document text
    • http://fgosvo.ru/files/files/wigozopufifamak.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/78432680910.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/godenope.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/18942278917.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/zidolisomowojiwaraduwa.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/54320161891.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134846c772d7---totodi.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/zoxawidodekanokowitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=step+up+2+the+streets+123moviesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 21140 bytes
SHA-256: dc5f41d833b81914141042bff49a264344c8ce512e59385d18cb497f8b393dd4
font_01_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 10788 bytes
SHA-256: 223140fd2c2f170faae9576944c7b112e32297d62236d8a2565c218d079a3529
font_02_sfnt_off00013ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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