Malicious PDF — malware analysis report

Static analysis result for SHA-256 264a1e194c94ad31…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 21:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e0a4fc3aecacdeaad1fee216be246a3 SHA-1: 8e1bde37ba0dd07c1b4d918d58495b38c3f8b23f SHA-256: 264a1e194c94ad311f26e492bee4518e614eff50451105c68cb53a23a6ae4514
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gifarlcm.com/upfiles/editor/files/96684357818.pdf In PDF document text
    • http://ourgans.org/userfiles/files/91669568650.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/59399622414.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_230006.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gisepajuniju.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/zoduvufimomu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210906_ED51EF533955219B.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/4324952474.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/20688639077.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/wazobela.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/28527641258.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fecdc29f61cad65fdf3f6360c000f0bd/kerip.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/zujafozavakewamuvepenigo.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/gexozarifirafozobo.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/28251953769.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908195859_j8i8tp.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/nolizizopa.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/17155167781.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/sevarabem.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xinoromivedefobatimen.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616820b6a2---41779460302.pdfIn PDF document text
    • http://wsm.hk/images/files/basezifatebawovulixazij.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/kikegadanita.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/jilosoluzuxilupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+phone+to+iphone+data+transferPDF 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_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 10528 bytes
SHA-256: 1bbb64de1ba1eebb833044a45beed8c5ecbfcd9cce6b4d72a05fb9b682b7da0f
font_01_sfnt_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 17244 bytes
SHA-256: 862bebd17771c673d21f583417a12cca4941d5704c6dc9ee2c2a2f68ed26f5ca
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1