Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc522b002b25863f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 04:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39405a6ce260a2d12bb9c3582283431d SHA-1: 3cff9702a1e595667cd56ed2a0f11c6e3cda79ae SHA-256: dc522b002b25863fd58cfe83b1ebc213cf8e20c407212ac363d789d53955c2c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, 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 distribute malware or phish for credentials. While no scripts were explicitly extracted, the presence of many external URIs and the link farm nature of the document point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tao-oita.com/admin/upload_filesfile/fulawidezedejoxebifun.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/gagafodinopub.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/zixedolatosi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/sopigegovipizatusoluda.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6638680---neletemof.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/8931998839.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210907144734685.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/15523898676.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/dedaz.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/77046191233.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/13415550442.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/givisakakelu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zojafesokazabepufadanar.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fbp708qo505jus91f76lh3qvr0/favuvapevulip.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/14962737943.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/56369480397.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/84125222728.pdfIn PDF document text
    • http://anm-av.de/uploads/files/18759145402.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/48600035793.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/86276492472.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/ziwodozogomofubaso.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/manaximen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ac+market+apk+for+pcPDF 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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 10304 bytes
SHA-256: 22bba914edce2e73f2284a7b4fa9e8a4128e82f47196f345cd66dd5eb8d5345c
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 17212 bytes
SHA-256: 17fc91a92c552b46a0fe037368982ee7d66f569c86fb49e887c41c37e213fea3

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