Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1be2652c666c6f…

MALICIOUS

PDF

122.4 KB Created: 2021-10-14 11:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2888a530285494fe5bcf3bbaf7a99fe9 SHA-1: 5adb5bc2a524a9b6f89e30addebecf6a4d996360 SHA-256: 8e1be2652c666c6ff634785a56e5c74d719920c3e066dc062c6a27391e582d9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=bs+english+1st+semester+notes PDF link annotation
    • http://garmaclima.com/uploads/ckfinder/files/denatupakul.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/putuwi.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/93546671972.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/bosenerewazinasojejena.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/97019153197.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/15659392771.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ks5eo6p61fgcarpj8k9vi43taa/rewogevovizuv.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/sinokuzetedijisis.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/10313630634.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/65263333216.pdfIn PDF document text
    • https://sadex.pl/fck/file/46345064842.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vireri.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/31078981488.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/12261964534.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/64045761248.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/70357157490.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/85879853866.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/ginaxazakerisimil.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/32317931709.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/43287998101.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/lutunatujirofa.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/gidizin.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_off000171e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E1 23420 bytes
SHA-256: 18000e914dba52922e55370d2c38d5b4ef9474bd2198a4f94d855c2005ac245e
font_01_sfnt_off0001ac0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC0A 10496 bytes
SHA-256: f9c84bac5927da37088083f62f3195f39c68b6ee8923590b874fca919ff1ef5c
font_02_sfnt_off0001c3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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