Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7daaa34f0450f01…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 03:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: db7f05ec4790eea25b57a9c2341663d7 SHA-1: 8f056467ccf5a215b3cc45907966aa202cd792bc SHA-256: a7daaa34f0450f01188f706691b759fb78e5064542eb2604b55c943b9c88e9c9
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 0.9947

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://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/98052415957.pdf In PDF document text
    • http://electronicaindex.nl/images/uploads/72980484466.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/votaxafiluwupuno.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/55263035584.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab5db404e---niladatav.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sonewutufum.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/lijuvedifewifi.pdfIn PDF document text
    • https://yellowstonewildlife.com/39333157214.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fajuzaxevobejuneto.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/88874170904.pdfIn PDF document text
    • http://cwesp.biz/upload/file/37439520832.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109071059291796.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/fedezisidedusabenimuja.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vexozabavubesepuresij.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/pidokifonuvoguxasevin.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/26135147889.pdfIn PDF document text
    • http://montesantangelo.it/files/files/rateluzijexarod.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/29344953493.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/tenonosejopunoz.pdfIn PDF document text
    • http://fivelscope.net/fckimages/zugiwufiropajilup.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/jirip.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a6f171fd6f0af652f8e82a3af6c5ff8a/jabomefatibuzipavib.pdfIn PDF document text
    • http://keramann.ru/uploads/files/gojegevizuposi.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/47169761943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sword+and+sandals+2+download+full+versionPDF 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10696 bytes
SHA-256: 6d5b2ca942daa912667181cb23a5ad3bc59c54b96e62c0d16ef9a4577a9c9343
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 18376 bytes
SHA-256: 810cd4d66a94ddd26d27fd7d0558a6372ab44f648c40e2bf854ebd00b3c70d6f