Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb4b2423bf9bad7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 22:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07e3b7b416162f7c41ec8596998f5d21 SHA-1: 73edd555a4c3a3108b6ca39145da06db08fbef0d SHA-256: aeb4b2423bf9bad71bd837747a267ff91e7beace69f1632f852f3dbd30c42644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://btsoft.vn/uploads/files/69787161184.pdf In PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fisavefakomovojepagixe.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/8057104300.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109070618427196.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/fuxoguripaniwotojob.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tunofilezabulilidimusu.pdfIn PDF document text
    • http://qdjshg.com/files/file/73628957799.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/39870168683.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/tudexumo.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/buzujepagokegifox.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/jegavipekujatigawajam.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/97842023600.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/todosuzedivikesubi.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/zomafukosufusolakab.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/petiz.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/xiwonuzixut.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/2735234276.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c56c8ab7e03dd7fdfe3d63f76ff5b437/30319835223.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/41486222648.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wodiroj.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba03d099b9---rerun.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=youpin+wanbo+t2+maxPDF 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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 18060 bytes
SHA-256: 3b1554d4ee7475c3f4d39ea645d9c390d240bf6b8addc2679b355c0ebddecc14
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 10496 bytes
SHA-256: 7448e9a99fdfc6aaf50a0c43166d78b6b5fc64bc96eedea0d61744fac0c846f4
font_02_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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