Malicious PDF — malware analysis report

Static analysis result for SHA-256 627695bb7be2e699…

MALICIOUS

PDF

83.4 KB Created: 2021-04-06 19:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6bf58607737fdc4e273721192a6a9f1d SHA-1: 8b6faeb6b34db91c3e60b44efa7e60712533aa51 SHA-256: 627695bb7be2e699ba6985fb5573bd306953b3638257042255f32b9208f96078
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically using a 'Browser extension / update installation lure' heuristic. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links and the social engineering lure indicate a high likelihood of malicious intent, possibly involving JavaScript execution within the PDF to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gimoguvi.ru/wix?keyword=pirate+bay+proxy+vpn PDF link annotation
    • https://cdn.sqhk.co/kulobibab/jOjdvid/kungfu_warrior_mod_apk_android_1.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/nevoniso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fe797ab0199c.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/zifolugupizudan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_6068ace9c93d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5fcb537009372.pdfIn PDF document text
    • http://realwockyc.info/english_grammar_for_ssc_downloadcrx1f.pdfIn PDF document text
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/b4e1d9484810a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_603c678a8f8f9.pdfIn PDF document text
    • https://jazoruwaru.weebly.com/uploads/1/3/2/7/132710784/xoteboxalixotumus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_600d95f32ed82.pdfIn PDF document text
    • http://perevozka.ru/kebogedajafokolakfo8xz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5fe650efbe4e4.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/gumevozamupavisixuwa.pdfIn PDF document text
    • http://tehnopolis.org/calories_taco_bell_power_bowlan64x.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jdic5Wl/pluto_tv_nfl_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_605f886baa4eb.pdfIn PDF document text
    • https://jamofavoxaf.weebly.com/uploads/1/3/4/6/134698870/4941034b291a.pdfIn PDF document text
    • http://ig-soft-team.com/98818240403ybvxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 4972 bytes
SHA-256: 83f01782a09d3c2548f40139c6cc0b886adfc30281fc57b0c07109621aa5cffe
font_01_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10764 bytes
SHA-256: fff041f46b48cb6c0156c2f335f5e5a77f1595d4feefe2a6643ef5006781938f