Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0153890574026f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 21:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 961b548ed4abfb5e39bf8781ceb13210 SHA-1: 8ad60ab6a3478834f571b04934dd6c221c58cab1 SHA-256: db0153890574026fccdfa99d99eb1892fe368aacb65b2d2b446ced9c6f653229
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external, potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=shareit+mi+download PDF link annotation
    • http://agrobud.net/uploaded/file/28584810916.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/56718479910.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/78122279020.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/96238945393.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/52492772479.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6721227753.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/53871879495.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aspl40irk13ntnkevt6qf33k6c/43617223173.pdfIn PDF document text
    • http://baove24h.org/upload/files/kegemufakutokujamog.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/48729344885.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/74463824728.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/52823403037.pdfIn PDF document text
    • http://4darchitecture.org/img/all/6808224132.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/364867ed706d465708fdfbb8239da737/3312800708.pdfIn PDF document text
    • https://partnermind.cz/images/files/62688758797.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/regedejamanizalipogivutid.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/jirozuxejufazitejo.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/kivasavulizo.pdfIn PDF document text
    • http://vodnik48.ru/content/file/99544814647.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/50088487719.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/84375459027.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/fexudaw.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/32078444839.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210909055528.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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 10504 bytes
SHA-256: 728908ab54921001439114b37cf93e8e3f8ae8ed0fca117c3516618bbabb84c8
font_02_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 17836 bytes
SHA-256: 7cbc7e41f3f9c97e717e8553df06ce231fa2ed14574bf699a3f70bf9808b0ebb