Malicious PDF — malware analysis report

Static analysis result for SHA-256 e750a11f7b0c3250…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 14:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85b3aa9a734d633c15b86bb9b6aef908 SHA-1: 31465489d7eb24ebf84c79aebee49ffe4adf27de SHA-256: e750a11f7b0c32506bba9f3b3d81444a2d05fa266ac5ee4c051ca8dcc6a6e049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=best+games+to+play+with+girlfriend+on+phone PDF link annotation
    • http://masan315.net/board/imagefile/file/petolidonimodudeluzuk.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6ec386ef3780e06a6715e80b28b29032/64035824393.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/31298528610.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/lifobanararijebiwozep.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/83813952678.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091413292173499.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/topidigilugonajixa.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/nurofasofepupop.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jezifaralofetaxepa.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///botulokatamojotusi.pdfIn PDF document text
    • http://17njl.com/userfiles/files/85908451069.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/fitot.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/27034758306.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/kitozaguv.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/45983813316.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/42936581279.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/somanodujogivedilovasax.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/03051110514.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/maragovojumos.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-18/20210918185027438320.pdfIn PDF document text
    • https://baglab.pl/galeria/file/30051064223.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d01e84cac5c814f407c5d1f5513bf976/vejatuv.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/xapiziwepum.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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 11200 bytes
SHA-256: 6821a420ff8604819c31d1955170b0418adbf327382a43e6b0cf39a1b5611a70
font_01_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 17056 bytes
SHA-256: fc50dbdf98f3ffa2116befe5043a86ac8377cb4773a78bcb743f2ea4a872cc8f

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