Malicious PDF — malware analysis report

Static analysis result for SHA-256 05318af16d6b213b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 07:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8559cf747ed507787986e4eee7cdd6ac SHA-1: a13e63c77f9dc1844dd9eaa345e187c5490eaf04 SHA-256: 05318af16d6b213b8f9b317d19dfaceb2bf7065ad06556a0ecb32dc871808a77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs pointing to disposable domains, coupled with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.flamanville-76.fr/upload/file/seluvekimiwepubuzulo.pdf In PDF document text
    • http://poiskvod.ru/images/file/xivenolivebewebotim.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/99262195222.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/zegenila.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/xeginivavabog.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/sobafagudavezuniw.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/54557406711.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/54583033517.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/46499406307.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tiwer.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/99069427409.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/robixitaju.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/59042949423.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/9593560343.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252a21d1a3---98113299957.pdfIn PDF document text
    • https://techlan.pl/files/file/winokakav.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/11533155128.pdfIn PDF document text
    • http://travellerisland.com/files/xagemil.pdfIn PDF document text
    • http://kes.org/upload/editor/files/21334608993.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/taziwijovulubuti.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/27616270331.pdfIn PDF document text
    • http://osayit.com/images/file/fujimunakupejapalezo.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/68605663653.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/14182970026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+change+sim+pinPDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 10800 bytes
SHA-256: a62e2143f36e104f18042f3eaf0c9ad99636eb63df1f3b986eec9444d6f36ad7
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 14412 bytes
SHA-256: 8a939b44005efe1456c597972da075cb3b5f1138cd15ff74384f36d88e779b05
font_02_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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