Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc6c23661f34bbb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 05:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a10056f4a19e870f0d3778fa4ff0ba6f SHA-1: 904d5cdeefbc13df2f7e93e72b128c948133d094 SHA-256: 5dc6c23661f34bbb06fc2a179ccc5e5de30ac35ece7788e4c0b583a954cadeb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document functions as a link farm, likely to direct users to phishing sites or download further malware. No scripts were extracted, but the presence of external URIs and the link farm nature points towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://podlahypilat.cz/admin/file/57585617864.pdf In PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/17054189682.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/48118384772.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/47500798855.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/rutixopetolatupimujexileb.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/fetilosoferapilo.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/dafibilasof.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/tofexevi.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/12973932786.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/malifekapulitowogetiwiso.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/46453645312.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/wufinenew.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/86381418217.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c591e2149---xesikepikude.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/wazosomigax.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/96672746159.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/kubupaxoku.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/43856178534.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb9572d3e---ruwakosajomivigade.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/19687776730.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/51200207380.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/14393129559.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/sodogobozifutajopiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+download+free+for+android+latest+versionPDF 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_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 18344 bytes
SHA-256: 91fee25de207bf44942cf916355ec2028f64352f8f0ec833654aa3a9312b672f
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10636 bytes
SHA-256: d73120e03f2c44ba80ecc6dd910a455f96ccfea40a8529b81027154a7e46be9a
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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