Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b212955495d3701…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 08:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a5f27ac5ff2f5ac821caa518bcd9236 SHA-1: 5bdb8c3a273747bd1f6e9523549426ceaa70fc59 SHA-256: 1b212955495d37013296688ca6a4cdd75e8362da476e6e62ff0aa57a16d7aa2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, consistent with a link farm used for phishing or distributing further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, suggesting the PDF is designed to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://dunaweb.co/bg_image/files/21727061234.pdf In PDF document text
    • http://tabletopad.com/images/file/piwesujajomelefosoj.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/74152726267.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/kogaxefevuwotosifo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wuvivemidupixadimutamud.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/50681493194.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/14856579420.pdfIn PDF document text
    • http://tecksco.com/upload/files/zavutukibif.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/taniwanafuwenir.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/3878402848.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/tozuvopofosowutapaj.pdfIn PDF document text
    • https://mbbs.hr/files/12528918268.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/sodegakumidunefawajisalu.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/26081793593.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddb560f02---21555570994.pdfIn PDF document text
    • http://halaljones.com/uploads/files/95780128425.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e45fe672d5---80727268893.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/35338610534.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/lipozabepunizoxozure.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/gekutinalilawixafebanivu.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/pudimivuzigikama.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/94296209392.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109120446493105.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/liferasuro.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/3747506896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aesthetic+widget+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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 10672 bytes
SHA-256: 81bf689620ccbf5c04cbcb437eb5a215aac3ab3a45aff2228574050c2eaeaf35
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 16796 bytes
SHA-256: d5f669fbaef9bd00c164f1945bbd1c586094cd4e60fe126484e408d052989102
font_02_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1