Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75ffb4fe72e9856…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 18:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af8afcc801ec425ec0aa9a1f0d5e7052 SHA-1: ba59bef35f465c7529928725aad1e2c6809c0c47 SHA-256: b75ffb4fe72e9856ee84d22020f30eabd13a6f2e7bb5f8013d1e135fafd6e03f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed for SEO manipulation or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=naruto+x+boruto+free+download PDF link annotation
    • https://actaviaserica.org/board/file/files/69244455372.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/pisejukutururutogude.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/litarikekowerito.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/vibamevezokuteduw.pdfIn PDF document text
    • http://vce34.ru/attachments/file/88794508799.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/93222399734.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/37715078754.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/wosowovemeva.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/repubavo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/58510637469.pdfIn PDF document text
    • http://yonetim.e-cari.com/upload/files/73229995808.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vosubinedelunaf.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/tejijowikoje.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/76777688634.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/66100121771.pdfIn PDF document text
    • http://medica-brno.com/files/taminelogamimizot.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/11472212429.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/72213423209.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/045720uo2b3q6nvil42e92vqc1/22592612094.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/18728446167.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/32879813398.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/jikudi.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/mizegesefan.pdfIn PDF document text
    • 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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 15948 bytes
SHA-256: b7be8d12d572a83e0ce00585e0527c8402a7ddd3dfaf43bc940ad17fce767c10
font_02_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 10492 bytes
SHA-256: 16d19cfd1ab6284aabe45f3a07de4685b87d944f64df83f3b56f2c175040e705

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