Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9a24315bad85c3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 10:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 74682565db4bf42e3592494912e0f026 SHA-1: 61f8d4de9c36d0652b61c8444c88e88664c9a141 SHA-256: ba9a24315bad85c351cb70c1b6d2f039d063279ee30367e42cc5b7095ee52c13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=what+is+a+group+of+words+that+work+together+to+express+an+idea+and+can+function+as+a+noun+adjective+verb+or+adverb PDF link annotation
    • http://csc-020.com/userfiles/file/20210901071631_fm2upo.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/jifomomilusarijisixawaf.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/vubevaseluradusujo.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/70510228763.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/viraxodapiw.pdfIn PDF document text
    • https://rubfila.in/files/file/wejavigofawunamujiso.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/8290819844.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/84905093852.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vuweridajogirigigu.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/32217650620.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/9230037298.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/52460591601.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/38720429995.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/11387113682.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/zavimesibuki.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/28954792313.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/93056659721.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/davufavimabimejoj.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109122137324434.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/velemel.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/gekozekalaka.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/43793911936.pdfIn PDF document text
    • 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_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 11564 bytes
SHA-256: 8acac61d5dc1eec26c60ef8eb7cb1aa5c777814d70016106b9545587756cf95c
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 19464 bytes
SHA-256: 88771e44696e1c7813c214ff248f13d7a2b12c680cd81cfa52469199d7538360
font_02_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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