Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55df4992eed6ca7…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 14:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa40eb9ff325ba62f49b5fa796d4256f SHA-1: 6c0a20dadbdedf3da2dc63bbdcc4c7bf070ccc85 SHA-256: a55df4992eed6ca7324045701c64af064dc01f584faa2e5f1fa47c5cdf437b71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://hemeringen.de/ckeditor_ablage/userfiles/files/zujaroninogu.pdf In PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/meredagonuxaxadakulowaj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451afe3fd17---ziwusuribosivuwepili.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/dizirirakovuzozov.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dafinolawatigamebexa.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/83175582138.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/42687861688.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/pubokagujewefakofojojo.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/zeramuverasafuwamaxad.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/34111631833.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/81016164477.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/luweneg.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/77975633892.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/22126272909.pdfIn PDF document text
    • https://digireg.lu/upload/27830127383.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/98879840185.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/41678506015.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/59614016081.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/gejazivexek.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/32645935031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=role+of+coral+reefs+in+ecosystemPDF 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_off0000aad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD7 15476 bytes
SHA-256: b50467af288ba55f2cd829ff263ac6372a589d3cf8dca8b5ed8c413374ee7d1c
font_01_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 10656 bytes
SHA-256: 36e29eb33fcbc8d4ce0ea381dd8214cc2005e4b94726f767def3dce5d38d8b9d

Open this report in the interactive analyzer, or submit your own file for analysis.