Malicious PDF — malware analysis report

Static analysis result for SHA-256 6541e1f934f4bd44…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 13:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bb0443b7dfd7fcd266266c8603218900 SHA-1: 910e17f53379c25f448a8391f0d271f2a0e72c48 SHA-256: 6541e1f934f4bd44e2fc2ff4839dc79812ee87b189fa81119cc89185cf56c77d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a scheme to distribute links to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pharma-tools.pl/galeria/file/57649669234.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/95579435554.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/jirepijaveliwegagul.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dowedeluvupun.pdfIn PDF document text
    • https://lordoptika.hu/files/files/momifalegepozejule.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/veximokak.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/pesirusigubituxo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614401a8ae12a---sobapofalazarozuf.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/95084895993.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/ripefatizopekazogubuz.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/89785862682.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c2c63412eda545203b8dc9d359a3cbb5/zepaw.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/vofif.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/wepolorajov.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/23374064134.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/18300983589.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/ropuzamofiruravasobaforiv.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/jigusetoputitaliraduzama.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/fobejibedewepidulepux.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/lojaz.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/pogatif.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/dijakugiwil.pdfIn PDF document text
    • https://ahha.az/userfiles/file/9419144818.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/pezeximulurogon.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/30034814842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=anime+tv+for+pc+free+downloadPDF 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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10748 bytes
SHA-256: 283901223f9a816b58911cc0954675b57529a492e1e3a754eea5975876bdcd0e
font_02_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 17644 bytes
SHA-256: 386ca9a2220cfd5914b53f27f116e1b720d6a76371f28ae903e96e7d62cfd9f7