Malicious PDF — malware analysis report

Static analysis result for SHA-256 121c88a08bd6ce43…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 23:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33d9e8f164d31aff9e16ad9cd45dae38 SHA-1: 869f8bed83042f2be8b92aa0f0d3fcc2a9afd31a SHA-256: 121c88a08bd6ce43ca2e25eecd84803836036141113afb555c0d865e38b154f8
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://enerjimakine.com/tsrm1/img/userfiles/file/36079319675.pdf In PDF document text
    • http://novichiha.ru/pic/file/93204693747.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/widelal.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/kajapodaxix.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/bosixuwifida.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/93201374640.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c5bbe98c---7854666406.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/37041740323.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/73055327210.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/welomur.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/12972790703.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v5jg89j4i3ekj9corfa77jqpll/xolabelipoxami.pdfIn PDF document text
    • http://nemochem.cn/upload/files/5831094486.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-15/images/files/kanaxobidepi.pdfIn PDF document text
    • http://araonline.hu/uploads/file/96641724636.pdfIn PDF document text
    • http://scpt.it/userfiles/files/wubin.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/79653028276.pdfIn PDF document text
    • https://777mto.com/contents/files/xowoju.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109082102124628.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/74049684616.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/39044969561.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/58738442905.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/98962592702.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/8614274556.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/75946693986.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/25522962386.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/pedirulusodivoreku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+advanced+bluetooth+settingsPDF 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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 16572 bytes
SHA-256: d07b4ebf367fdcccb7199bd8d34c7bbf5bbd783ed26f6415dead2311ef9aebe8
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10936 bytes
SHA-256: d851c48d5dd386ccd240ad459b73c19a35a11fa2c6f2545d82a4ccc25e9ed78a
font_02_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1