Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ce9310f1122079…

MALICIOUS

PDF

73.7 KB Created: 2021-10-09 09:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71ed5fabc53587a291bdbce5fa669c1e SHA-1: 43660327e074b76108f48d676e8ecbb7d2584d64 SHA-256: e0ce9310f11220797a04dd94674b7c6cbe63a3f44bd104f5eddc5e1f9b33e929
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, many of which appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://urbanlivin.lu/userfiles/files/kusosaxofisudiw.pdf In PDF document text
    • http://michael-dhom.com/webseiten/file/92648199591.pdfIn PDF document text
    • https://htchninc.com/d/files/57491459471.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/fojawoduto.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/18708625036.pdfIn PDF document text
    • http://e-hematologica.com/users/file/riloxeralabuv.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/69434582459.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/10820300759.pdfIn PDF document text
    • https://mlspoland.co/files/file/wewanupoto.pdfIn PDF document text
    • http://thepartybooker.com/userfiles/file/delokaresiseviwuroxevumu.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/memakavokirevi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143927f27236---gudovebabuwero.pdfIn PDF document text
    • http://keramann.ru/uploads/files/zebawipibanijuxobogowowop.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/gofab.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/nikizadivomidasu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916091920173097.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/21007460236.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/jelagunoguvokos.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/zazaxok.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wizajelojevuberunateti.pdfIn PDF document text
    • http://santeh.md/img/files/81333604103.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/tolidoxinubulelereges.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/38329661385.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/35783250459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=and+thank+youPDF 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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 17116 bytes
SHA-256: 909808eae9a7eb2cc53614c7309e5c879872c8d940a4142be7502dfdd43ccd40
font_01_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 10096 bytes
SHA-256: acc60678394bb3778d11a3f53b4c2d739f3be24694ff6bcc05b384ccfed63ed1
font_02_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1