Malicious PDF — malware analysis report

Static analysis result for SHA-256 1738a5639d8d119f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 14:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25710a13156b27ce7d1f0fdff1a683e0 SHA-1: a05ff602a6caf0a4a17d40898488e208afa2339f SHA-256: 1738a5639d8d119f97b0a4a3b2d0aeff1f15c2bc37ec5bdb08d3fbbb70e297ce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting. The ClamAV detection and the heuristic identifying it as a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://philabc.ru/uplcv?utm_term=free+android+apps+downloads+apk PDF link annotation
    • http://smm-mm.com/uploads/news_file/zixawobubikor.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/makesuwoto.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/86814280930.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/lujere.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/85693344037.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/tukisizumujezaxex.pdfIn PDF document text
    • http://szm.hu/userfiles/file/sufelinujufasofixisip.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/tabubutoruwir.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b2e16205ebae952d28be9587dea8dc4a/16861348293.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/wexofebimipanep.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/wiwukazizeg.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/11540333396.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/65058718356.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/37205340006.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/78239497350.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630473889.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/20129973969.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/58882290281.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/24235003452.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902082125_790222334.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/13761832541.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fapofuvotesobel.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/sadurezuxike.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/nonizox.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10440 bytes
SHA-256: 43dd00dd3c243ade5ced482ea1ca3f019b75974fa9100b137e075c35a40d4ac5

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