Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6d199243f192b7…

MALICIOUS

PDF

64.4 KB Created: 2021-02-15 05:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9602a7a96af817bbfc9b01dffbacf081 SHA-1: a4f8a3d499b857133f22f8ef717fc4cbd575fcca SHA-256: ad6d199243f192b7af4daa8fce97f926ced33f1559e2a97725e19e3c5c146a3e
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate it's a link farm designed for SEO, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of multiple suspicious URLs suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=1+on+1+tennis+unblocked+66 PDF link annotation
    • http://hellovendi.com/susixem0q16.pdfIn PDF document text
    • http://sallely.xyz/cerebral_cavernous_malformation_disease_prevalencejehih.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412773/normal_5fe438254aca3.pdfIn PDF document text
    • http://ellmax-site.xyz/xanodatovagenedmt49i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5ff016ac0d7a8.pdfIn PDF document text
    • http://myyshooop227.site/sizefgsp4s.pdfIn PDF document text
    • http://golosa-spasibo.ru/ncert_accountancy_book_class_11_solutions2xyu4.pdfIn PDF document text
    • http://bachanalytics.com/razesipibipxn1dx.pdfIn PDF document text
    • http://adminhalil.com/95319703711ztz33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_6001db1064584.pdfIn PDF document text
    • http://shoes-storie.club/boruto_manga_chapter_13px30z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/at_t_u_verse_channel_guide_indianapolis.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/pogarezatuzogunebinen.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/apprenticeship_registration_form_2019_last_date.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 4940 bytes
SHA-256: d8f607a6c1bcb9b4b501af83631612d3169828be49f5853bb08409b0e1cc1698
font_01_sfnt_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 10252 bytes
SHA-256: 60457c759a8c1fd6b8bc88b98c70a6d8878f2b112ad71ac69f2d9c3e5a3351b5

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