Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fa0c962affee71…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 10:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee745e0b074c1a022911d7c0ea9845f0 SHA-1: ec567636c6862f1631df4288591b3d190a85f0de SHA-256: 86fa0c962affee717ed4e531344ae2f293b24c6b9d9556d6b7b665bef07b094e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. This behavior, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious intent by using a large number of distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.singchai.co.th/ckfinder/userfiles/files/48330288564.pdf In PDF document text
    • http://vivo-mebel.ru/upload/file/witelariweturopivekovu.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/ruzibu.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/470782926.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22807670458.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/pujodonolaserinavuzatum.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/temugepiven.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/8935820398.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/9333080356.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/54757473480.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/raririmitibekufarekosediz.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/megogotikutavugukikawusub.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/jalopijikowexemixajaw.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/puxopokisi.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/ligelufotopamibunoralip.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/zitipexosizikoselej.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109051501235338.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/47031472834.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/81417960352.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/78092750724.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/jegif.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f90ab45684536c99bff1252024a8e860/10111917182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+music+to+sd+card+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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 18644 bytes
SHA-256: faaee8947c7640fe330c089b305358747ed45c7cb7a544f43cc4ea330e01dafb
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10588 bytes
SHA-256: f44fb0ab1038e87dd31ea9b5abc2d3c9219c2fd3c3e5f4f4799a6e274ad2cf4f

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