Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7777c84a11a695a…

MALICIOUS

PDF

91.8 KB Created: 2021-09-23 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5403668e21174af6d824dfd7eb0d99c SHA-1: 2d46c2e417c4e6695c70595ad3ce7ef3d52afd91 SHA-256: c7777c84a11a695a0c3591020496b990389f6e43e4de44f5c3a24b0f6167828e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=best+offline+gun+games PDF link annotation
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lukiv.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/talavadodij.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/dibetar.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/40541581332.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/pugituk.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/jejajozavifupawetej.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/kilavimikomamepolozuxufik.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/63504951187.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/rulitelobexunakazeko.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/gevevinokilijupujarur.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51115435573.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nanopuvu.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/wigekenopanerovin.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144418210a65---59265052638.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/nuvulaxepasuxetamax.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tekujuxe.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/83960367127.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/33805847310.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/14673197424.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/8349961367.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/39669884706.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zenob.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/72373019880.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/soxiro.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_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 17552 bytes
SHA-256: 6e60b4313b7bf5404a1b8402889fede82bb4f20ee8fb18d75e1ae4856ba940f8
font_01_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14985 10608 bytes
SHA-256: a2218931924cbfa5d77047602ac50b5fcd4bd2d5ff134f4af1d54d954d2a3f7f

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