Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd27131410d9369c…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 08:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ff99bced6bba245ff91b67ef8799e6e SHA-1: a7e80a6c66d417513c6435b427a89a01f20f43ad SHA-256: bd27131410d9369c8364523ee26ce66b9e144f809621f0039e9ee0575041be12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421aded4a7e---19783209140.pdf In PDF document text
    • https://ecoverservice.be/gallery/file/supibojoja.pdfIn PDF document text
    • http://iccarrentals.com/files/file/30723941602.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/zagebudevevitoxon.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/gudobebizamu.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/13434611286.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/bubivuvamagaz.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/93982520062.pdfIn PDF document text
    • http://heizler.hu/files/file/foseribom.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/gosuniwaf.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/14028141886.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/3989235333.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/gimanibawamavepewonitav.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/mosujunajave.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/30689011262.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/jawojivop.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/potimozix.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/55458660595.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/tuwewutatud.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/22765077062.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/raxosoxebe.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/dimalowimawe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911194816674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sonic+racing+transformed+apk+modPDF 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_off0000be55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE55 11084 bytes
SHA-256: eae38c6eb9c267abb9f8a7f8f0d0a11f615ac70d44281e402c8b5ca071bc7cd4
font_01_sfnt_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 16272 bytes
SHA-256: d9c93c1630daf937db5e0aae3ad4b5474d65e855a7a3b411ffbd87c941403025
font_02_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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