Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3d3f0e07e97fb4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 23:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdd9eacbc8d3fe0ae47158bc74c8f36e SHA-1: 996e458644eb02ea76d01e2d95386f0bd678a31f SHA-256: cb3d3f0e07e97fb46f48dd66a94ec541c82e03466877db9202b0aaa0ccada545
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=simcity+5+cheat+engine PDF link annotation
    • http://nbc.ua/design/pic/file/88505973756.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/51247162377.pdfIn PDF document text
    • https://network-italia.it/file/23180930466.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/munofatoturafu.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/89310215368.pdfIn PDF document text
    • https://yellowstonewildlife.com/zixilowubefe.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/sexenotixususomajuge.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/dugizipatiwuwefapexozixif.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/bawimitusen.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/60764505290.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/96876206454.pdfIn PDF document text
    • http://itena.si/uporabnik/file/53083282510.pdfIn PDF document text
    • http://premo.at/userfiles/file/lugujunoz.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/71174285382.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/23023482971.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/14130392849.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e190dbe5---91563873949.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vimonawuweborojezusovari.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/tomavawililivilimu.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/sinapusenud.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/2909074878.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/97290654032.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/tixikalabofadidemedut.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69450a04b---89876071594.pdfIn PDF document text
    • 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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 18724 bytes
SHA-256: d5873e404f33716459d17978635dc5871518d6f9a8f0c8bc1cdd95994e55148a
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 10568 bytes
SHA-256: d8591b00afaf75b709730116daebfe31354f62552ca604218cdac4bd89f0a467

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