Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f64809c35ea999…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 11:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3589814f35b20e0b6d381960cd251b10 SHA-1: bd25b60321b7e1a4f22ed4a75f645ac33c3e1201 SHA-256: 39f64809c35ea999b9bbbd7077234b49be2ec5d18c201bdfe3d1aa14ea20882e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which point to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=21.8+k+means PDF link annotation
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/80046335668.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/daa5e27659a774d431009647996d0fa0/33360875327.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zotawabekuj.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/bemoxevasixoxo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/92553363465.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/83214410696.pdfIn PDF document text
    • http://hoachattn.com/image/files/nexododudusaniv.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/53204990483.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/86605711231.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/sakoleludetasolode.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219262143138663.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161482ba847733---nilisivanogi.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/25101739478.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/guwaverex.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/dazukawuw.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/sonefezumoboku.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/95307930987.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090907175373499.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/36421505684.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/nemuxavuzuxi.pdfIn PDF document text
    • http://htwy.com/upload/file/viguwanedu.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/mogemub.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_off0000ac44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC44 10256 bytes
SHA-256: f017e54eab19858124607ceef5ffdf405fcf2b9bf306ac80746e35d8d8c778a3
font_01_sfnt_off0000c35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35D 15248 bytes
SHA-256: 48eaaf2c149c430341ed5e8fc9e9d2aa7a1f93ebce10be4a6d3dcf893b567fa6
font_02_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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