Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d907d2e33615ca…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 16:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9572c30a6585ecc8aa42072534269395 SHA-1: 97827ea8e574b68b246c426a1199e60664a0f919 SHA-256: d3d907d2e33615ca94f8902a88bbae0e68bc6c9e1f58b76b421bf923b0057fa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=mehndi+design+easy+and+beautiful+for+kids PDF link annotation
    • http://ashole.hu/UserFiles/File/letikosipofa.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/51418489342.pdfIn PDF document text
    • http://showdoimovel.com/files/files/72823163151.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/xunexumo.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/76674742982.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/28375392363.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/16831464625.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bumepuguw.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/lalapozufapum.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/nekulirizej.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/41536173636.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/18212590506.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c60b43743d1f17c87c7973fa1d6fa1a/21404878598.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/befakunakixunobatuxoju.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/93071883171.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a62c5545c52b2b4b3df9f77a2988449/dubisusenatagolowuv.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/86750610081.pdfIn PDF document text
    • http://contua.org/userfiles/file/kelotadobazeviniwowini.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/dusaxopipodoje.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wasepaxivesani.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/65720885597.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/76915994527.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/lolomawugirolejunuzuduk.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/fikuwupusixinukizujo.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 16428 bytes
SHA-256: c0d963c9596814db3d9eba2bd51833ff4534d7269388bb541d8ce24aeb82bd44
font_01_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 11072 bytes
SHA-256: b4cbb45dbe7c8082438b5d48ffc78253a22921c018522cdb7495bce21d72b481