Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8768fdb7e2462b7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 11:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84274ff6faa64a1a82c2800681391579 SHA-1: 4690221dac8b2caf3071bcee2fb9dde17abda6e8 SHA-256: e8768fdb7e2462b7bed0197d98614c8d2b00ac24dec3bb85531eb1c9db9f999c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. 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 PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://catamma.ru/uplcv?utm_term=apps+to+change+the+font+on+your+phone PDF link annotation
    • https://mama-light.net/business_school/uploads/file/jariseteku.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/73139799011.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/87751413729.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/928390087.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/xavopan.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/fezogidigimunided.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/galamiturupaxagada.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909181220.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/zazufibigadowaviwipevo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/63404ae66e7b56bec5e1644659e23495/30624115936.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/binalile.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/29563898018.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/76225016690.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/99568854233.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/rotizegav.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/7799174007.pdfIn PDF document text
    • https://mklaassen.nl/images/file/42163274164.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/92722779655.pdfIn PDF document text
    • http://digifast.cz/userfiles/85028995242.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/83030048646.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/dedigixufadamosokisibav.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/83727114036.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/79163345208.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/kivigetakogivonizazorufa.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/98826908880.pdfIn PDF document text
    • http://tvsporedi.si/vsebina/71643722306.pdfIn PDF document text
    • https://jensbrode.de/files/file/wulelu.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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 10816 bytes
SHA-256: 092c9303d70831c5d108853c2e677ae415c9c21710e841a44695500fa3f6bacc
font_01_sfnt_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 17912 bytes
SHA-256: 9fed70c7645b0bcdbf27b453f5837efdfc853afa64ceef3bc9db272e45dd8bcd
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1