Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de3bc4c5219a21…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 20:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7850e641d04dd54be141d02cbb21884b SHA-1: e8594fc5935d9644054afbb9605f4e818c8ade88 SHA-256: 86de3bc4c5219a2134e98447380b577dee804faa19d25dfd5e4f8c89b3a39dd9
146 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The presence of numerous embedded URLs, many pointing to unknown reputation sites, supports a phishing or scam campaign. The document body was unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://austria-ex.com/images/blog/file/viwoxamodadatofujolanat.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/58076421505.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nonewizan.pdfIn PDF document text
    • http://minerva-collection.net/files/files/76386613584.pdfIn PDF document text
    • https://turbooto.vn/upload/files/82870825120.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202192483444667.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/gamijowosamofivisupex.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/32738137516.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/pazativiwafiripagajiju.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomexevesovikowarovezene.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210901153001_y0bifv.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136896c22cac---gujamikilisumugajetivodeb.pdfIn PDF document text
    • http://annabarons.com/files/files/wesoderugamozaturuleji.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/21798140680.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9e177031edd928fc1031ddbb939215bb/37339702749.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/42593212476.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/zexekekeluvirisa.pdfIn PDF document text
    • https://quote-supermarket.com/userfiles/file/pesusumupibikunopekomabax.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210908124617.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/98260452811.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/xavuzaxitedubatujej.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631160464_1.pdfIn PDF document text
    • https://norservis.cz/files/files/satedusuripud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=camera+app+stopped+working+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_off0000af15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF15 15912 bytes
SHA-256: bb3f52cce98476e2531eb4a2306639a3ce5a4d759e0b4927f15bdcd9eced51ed
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10896 bytes
SHA-256: bd3257c97b7e87f409c8fcb575a817e40fbc7f20c6ffdcde90aab8e6b2606264