Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7435a1484efbee…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 09:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec31c5e9eeb965b803f27dc664371ffd SHA-1: c227b23c572cb9a5109c44488c5d9d993048d7ae SHA-256: 2b7435a1484efbee32a98f1104c8a9a1fcdea9b5398cdf5050d90f35c8f7b909
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to phishing or malware sites. The presence of many unknown URLs further supports this, indicating a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://diamond-marketing.cz/soubory/lolexesemen.pdf In PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/66806195096.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94076519769.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210916_141208.pdfIn PDF document text
    • https://onecre.com/images/content/files/30499876481.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/78696182910.pdfIn PDF document text
    • https://akvaguru.hu/user/file/50678803056.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/zojewujakoduriviwugala.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/52242219894.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/jakigenax.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/tonebasat.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/66375931012.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/noforarolurutumomoxuli.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/93643528646.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/34696581325.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/90129074545.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/vizabika.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/336373620.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/94904755339.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/vavigixawu.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/71226657993.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50328813598.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wananaf.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/24395820603.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613723045fee7---tuxosegagejuvevole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=alien+blue+androidPDF 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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 10196 bytes
SHA-256: e6ed7129a2c1c4992b532bfc8133815740ea0438a8eb09071ed6c508ab04ed63
font_02_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 15364 bytes
SHA-256: fefeb1b82f4bc0887fd47a438fd042dc095e4e8aea98408bedc33303e508ed4d