Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b24490633d4292e…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 20:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 370a65347e75d0fc05fe49b804f0f6f1 SHA-1: 137afef0661c055d21d91cdafc313d54efce6a50 SHA-256: 5b24490633d4292e86a226244a9e2d9be784d1e73cb4456abd0e0c4f6859e4c9
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous links pointing to disposable domains, a common tactic for phishing and spam campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, suggesting the document's purpose is to redirect users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://demetraproject.eu/ckfinder/userfiles/files/77032236777.pdf In PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090801272667.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/76535084227.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109170712252367.pdfIn PDF document text
    • https://agatanorek.com/files/file/xolopitadixikikeditav.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dokaminefotupajuvugomogu.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/72986465583.pdfIn PDF document text
    • http://destock-groupe.com/userfiles/file/62752679639.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/81077864375.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/nivadeloji.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/wavigez.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gipowategosewipajif.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/kavunibir.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/12741949039.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/77780448241.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/lozamozedeboveg.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/20731362706.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/rapukasa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5436b9672---sorafo.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210905192503.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/65336757941.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/42451267519.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/12739681875.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/41068351944.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/11083141394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=micro+motion+study+isPDF 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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 10400 bytes
SHA-256: 6156d5dc79548d4473698edcdf6dec4e53584d2c055c270f204626a071795fbc
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 19836 bytes
SHA-256: ce6b8562f97765f56f39b0cb69c6daba20a409d34d370265fa090b69aa7e2ec3
font_02_sfnt_off00012633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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