Malicious PDF — malware analysis report

Static analysis result for SHA-256 534800b64e220114…

MALICIOUS

PDF

84.2 KB Created: 2021-10-04 16:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b59f634b355af019b53edf858b33127 SHA-1: 85e5a4ad355afceb7ab58eb39a1807c43ae59dbb SHA-256: 534800b64e220114166a60f7d63b10378c78578066502b8beda7589c5bc6f128
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it acts as a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mazraeir.com/images/upload/files/89968718041.pdf In PDF document text
    • http://thegioixedap.net/upload/files/78004124195.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/pejaliguperirakep.pdfIn PDF document text
    • https://eetravel.net/file/4264386525.pdfIn PDF document text
    • https://ikansambel.com/contents/files/53039751643.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gikinusodorawafex.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/47506751402.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/29629712179.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/94178177561.pdfIn PDF document text
    • http://babamoleskine.com/files/file/vaxeroloxinupe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b747105d05---gezawilozivok.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/66352265452.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/panivese.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gometevazapinazejeku.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/85170211047.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/dupofefunivimel.pdfIn PDF document text
    • https://proia.bg/userfiles/file/terosokuw.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/27721273796.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/paxopupasufebikujuvemomer.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/1912520344.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161465a947afce---96208121058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=famous+female+beach+volleyball+playersPDF 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 10848 bytes
SHA-256: a853ad8f8f3eca81497c9dd3f66ce8bba8c5fb0d439f6cb8967b416f84ebace7
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 19400 bytes
SHA-256: 41c5b0a10190aa6341472fc31925647a2c55a64e04ed8db117121f744c313519

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