Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17780b5d5872c48…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 18:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 135c8df9e5b89f3e3f44c5161cce4b70 SHA-1: 74f024c41b9f3f5f19426a0c85ba484e99f67fc2 SHA-256: b17780b5d5872c48b360c45949990d1f461a58013990b0182906552e5fb2c7a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of these links and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://101doctor.com/uploads/ckfiles/files/6139f6892f117.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/malokebavudopo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78834e0d5---garorudejus.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/dosuvevizozumemubobutig.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/nugulowuzebemekivunajamav.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/52865624883.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/23360876711.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bafeferag.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98699475069.pdfIn PDF document text
    • https://parc-hotel.info/file/71861903270.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010915092183.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/bodenalebilewobife.pdfIn PDF document text
    • https://pr-dienst.ch/file/89686665737.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xekevogefumifilavezadeb.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kibaxisetagipomirabaravo.pdfIn PDF document text
    • http://medrea.ru/upload/files/toxemizokotufonatetajaku.pdfIn PDF document text
    • http://forti.in/userfiles/file/99732636726.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/96686148009.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/xufosuvukusuleletab.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109080712417752.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/44070309905.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/zasefo.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/riberubaxos.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bolunelowugolegelasebutap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+game+for+android+multiplayerPDF 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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 11108 bytes
SHA-256: 894eaec91641b4af9c1e7fef717c62d1c5974ad1160b6a18d1cf3d8ebb0f97b1
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 17616 bytes
SHA-256: 507e0e09e802f6d98354deacf23c26d02a3f3c4aa73120fa6af1d293759453f3

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