Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bcbe2aaa9a3b0c…

MALICIOUS

PDF

73.1 KB Created: 2021-10-06 05:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 736028ac1615b86fc6207dba1ceb8b90 SHA-1: ec65e06eafad4679947b8a517cff7af1776e8538 SHA-256: 87bcbe2aaa9a3b0ce49a9752b00dc5d4f2489fc338d846829aca018cabaeb004
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, forming a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/5648404197.pdf In PDF document text
    • http://shinies.ru/img/lib/file/zoriwofakinobon.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/45391172162.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/31735867843.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/bobev.pdfIn PDF document text
    • http://tulga.ru/editor/files/40561308718.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jemiwedujij.pdfIn PDF document text
    • http://qzgj.cn/upload/file/mikobene.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/55859045523.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/tageniboxaluzuzidumorowo.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/zabukisotutabopilutin.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/52094443909.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/tupobem.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/86174401878.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/911269774.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///dipekoropexojorogubaseji.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/45154092221.pdfIn PDF document text
    • http://asqcert.net/files/files/47638552491.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/bixusejumazudogen.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/32775826048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=filemaker+pro+templates+libraryPDF 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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 17508 bytes
SHA-256: ee8096146cf9521599d9906e598e72e2cde6301d9d702cdbb2f68f2d3a50b1f7
font_02_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 10632 bytes
SHA-256: 7773d2f10ddfcfa15059dbc2c02db7b0c873ba95fcbce5c78b0b4372b92014be

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