Malicious PDF — malware analysis report

Static analysis result for SHA-256 af629a08da513544…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 19:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 056b553c997e62ebaa0e46cb1663a345 SHA-1: 6c5e62fcaa8953a9c2462be413e4aa91a530c485 SHA-256: af629a08da513544e5ccce39b2f2f4554de3fa0fdf5f7dfc92cb529b7e24abe0
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://gestcargo.com/uploadfiles/file/wotazakamaruwifipijajeno.pdf In PDF document text
    • http://alvit-bk.ru/userfiles/file/84415948197.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/fafawigebomitujufusituje.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/ludetowifekafe.pdfIn PDF document text
    • https://curvy.tw/upload/files/vojebabonadavagavo.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/33201261578.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/69248969453.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/77391360064.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/7378533455.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-16/20210916213522956086.pdfIn PDF document text
    • http://linker-apps.com/files/99749015544.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/lunodetewebinodafalukepi.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/disufef.pdfIn PDF document text
    • https://bunianco.com/other_files/File/dunimekonosonurufesumo.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rejaweberevafig.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/vuramulom.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/betowagivimoremovo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133ebad2e286---28464738686.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/romobupu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/7035815645.pdfIn PDF document text
    • https://orrizon.ru/images/file/64517393450.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/39317330960.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/52565287793.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/gefuwapipejibukotow.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbcb887f0---vobuwijanexerives.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/36366032541.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/24696558614.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/wawurunizomovuzerakorub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=old+greek+movies+with+english+subtitlesPDF 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_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 11044 bytes
SHA-256: 712d6845adcb76ce2a3adfc5bb132c577162688b57d7b2ac656dfdea262ffe36
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 18460 bytes
SHA-256: 9786978634c77025444a9535b3df3cf875462244a9bae0cc327e435ff31fb6b9
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1