Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e93392879b9d88…

MALICIOUS

PDF

95.7 KB Created: 2021-09-20 14:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca50173ba021f2e767fb531b13c29e0a SHA-1: 470add6de0b7758383d1bb0df4d567877ea954fd SHA-256: 70e93392879b9d8844003456734a306bfd8ddb0d70812c32b12aa88cf5616dd6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a specific ML classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs pointing to disposable domains and a link farm suggests a phishing or scam attempt. The document body was unreadable, but the heuristics strongly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=taken+3+123movies PDF link annotation
    • http://thaymanhinhlaptop.com/userfiles/file/15387305335.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/zekakebedadinipavawegus.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/14309968221.pdfIn PDF document text
    • http://fruitsad.pl/images/file/76113389891.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/wiranuxutagew.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/penemurunusaxizibopuxul.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/bapukalupiragovutila.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/nogeg.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090615054580554.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/49862097324.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zatowigabetovefipudowuvil.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109131918378267.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/97978150712.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/92100889345.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/semujezogirazakezonogofit.pdfIn PDF document text
    • http://centronegozi.com/public/leximalaxakogitolila.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/11380293283.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc0e56942---sedobawafogix.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210906182153.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d80df9d49477ccb667bd9e6c0531e550/91964810731.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/84019818237.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_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 19772 bytes
SHA-256: c9283b777e189300a402c28dae02e0254013186c4f0f2e92998feec2ae2f2b15
font_02_sfnt_off0001596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596A 10488 bytes
SHA-256: 87bbd324c469a2f5fa24e430f877d20590e270826494884123d7a883736071b1

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