Malicious PDF — malware analysis report

Static analysis result for SHA-256 86598a7d7edcd53c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 20:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa0f13a5aeab8a2b0235d9fcb030736d SHA-1: f5e33877aad45221af9b194684f485509df92abd SHA-256: 86598a7d7edcd53c72943d535f4567775fdc3e50a83afb63daa398875900a4a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=ir+blaster+in+redmi+note+9 PDF link annotation
    • http://biemmecommerciale.eu/userfiles/files/kamawunepulasavizatad.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/77037312650.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161423c190b1b8---93820913287.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/62108259736.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/31643931686.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/9071933578.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163208890265.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/91299757439.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58676229219.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/nokaxunepipokaji.pdfIn PDF document text
    • http://www.andreapondika.cz/file/safulet.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gojonogavegut.pdfIn PDF document text
    • https://goodline.by/userfiles/file/kafisorusedomex.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62892591639.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jadugeve.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/94910593082.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/95344889209.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/99380770392.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/49993998287.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/kenepojarujoni.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/sesixizuworedet.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/98602545508.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfdf91696---busulalawotaruzakari.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/jijubez.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00A 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 10668 bytes
SHA-256: e487ed6dc31f4cda480a16b4abcbc278f63a7d8316d6d62d4e61c1c34adb4144
font_02_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 21920 bytes
SHA-256: ca2741362f963ac64fa420e53cc6ed6d2db68ad3e5fd385d3c210d373addc6d1
font_04_sfnt_off00013cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB8 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc