Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c46295c5adfe33…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 00:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10dd533bc5850c744656a1f796ee6b76 SHA-1: 66d9f10d370c36cdddeb8a9b6dbad6186ad0013e SHA-256: 54c46295c5adfe33ca98a49bba9f0814f286a7927b8f876c66ba32bfd4f28dc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were directly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://neoneofytou.com/ckfinder/userfiles/files/xesikuvetosin.pdf In PDF document text
    • https://dodatnojamstvo.com/userfiles/file/37975773086.pdfIn PDF document text
    • http://mrybalko.ru/files/12828169494.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21725634870.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/jizololesatasixozesodowar.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/pinukufojawumuwopabopumu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/30464135594.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/rovitotakim.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/gajodowovukedobexedaniked.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/madek.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/17567405264.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16876036---98323638936.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/dalokapumapelitajub.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/rudawodegonipewasu.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/juruwopatenibumix.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/ruzexaw.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/nelurelukapu.pdfIn PDF document text
    • https://kawanmto.info/contents/files/91485035483.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/13046917100.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/35799067175.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/nilukamepenuvumadule.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/8877105224.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60d8c8a69---donaduzudamo.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tuxadamexodar.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/vomeleka.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kuburekewunakaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+pass+game+download+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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 18700 bytes
SHA-256: cfc2a0e99a829614971947f8a5bc3052b2ccf3128c417cf3c54616df1f82c658
font_01_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 10700 bytes
SHA-256: 701fe8538ccbb62a7079761453b2cfbf6bbee9fff21554059e8627b810ad60db