Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ff0bd340293ecd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 22:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bddc5c782c76110c5ad1409765b842fa SHA-1: 92b8f5f6827061696bd4c46930284f7df7cbb1e3 SHA-256: b6ff0bd340293ecd67c7048295f11afcb25a3857cb922956cdd0b1184f4ad3e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a tactic to obscure malicious links. While no scripts were explicitly extracted, the nature of the findings points towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://parklanehotel.asia/userfiles/file/83309462778.pdf In PDF document text
    • http://aptekadc.pl/userfiles/userfile/jovivetilu.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/xifakulubev.pdfIn PDF document text
    • http://laduses.nl/image/file/74859297574.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/piresokat.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/fimeruriz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb93b8a50---mabebituvesebusejes.pdfIn PDF document text
    • http://debten.net/UserFiles/File/mubosez.pdfIn PDF document text
    • http://qdjshg.com/files/file/tewapezoxibaparagov.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/pobusadeluzutapo.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/23739575684.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dawafete.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/mutepibixewiruduk.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xagujuzarunad.pdfIn PDF document text
    • http://maidichike.com/upload/files/pekaxutigejifulepeginefow.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614560b4664ae---fenoz.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/towigizewaloxupofexi.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wemop.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192200242281.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/xavororudivotaripozi.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/baxakazagefoferes.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/sokipidazejifeva.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/60546087027.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nitetijoxironeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+engine+for+android+game+developmentPDF 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 18116 bytes
SHA-256: 0c61aa07c9cbfc17fc8842dc6dee61a7492445a4c315f8d463ea8f68d17fe9a5
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10960 bytes
SHA-256: 0b984a90c544a0a08387eb9dbb0acaeb62bd61b1fc8058c1024bc646ac75d649
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1