Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1dd1c6404af0ec…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 22:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2da436fa436d073ff6b175a67c215f58 SHA-1: a48bad17113fcffe197ee15590e483c57111e2fd SHA-256: 8b1dd1c6404af0ec2216dad7a3295898baa80fcab1ef33d6db303ea36ade01ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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 https://acgroupenterprise.com/userfiles/file/fikivenuzepuganawod.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdccdd3c0---tesatowabariv.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gubutosijadeloki.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/85775385034.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/nufebilolar.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/39906950563.pdfIn PDF document text
    • http://synphabase.ch/upload/file/babikuditukogunelu.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/70433207921.pdfIn PDF document text
    • https://istanajp2.com/contents/files/fizileget.pdfIn PDF document text
    • http://foxhill101.com/userimages/13541495954.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/13494206340.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/nawezumi.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/dogatobuke.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/bulazabanisopudadopazup.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/temonu.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/72672914234.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/27062534177.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/93474553526.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sitawosaza.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210904155313.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f963561c70---robisabiwivasuxodavelapa.pdfIn PDF document text
    • http://opersan.com/file/domotuf.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/70022163359.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/81990224694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+a+android+app+using+javaPDF 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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 11156 bytes
SHA-256: b406cba4f93d01d1ab028c2031b9536b1bb64bcabfb99718740d8207b163f476
font_02_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 18296 bytes
SHA-256: 16f55863432d572ed08f59e36c86b5feac43a4f11db23ff466b80220a4b8274a

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