Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc72d8bc31b84d62…

MALICIOUS

PDF

72.0 KB Created: 2021-04-06 08:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6171514e4b84541b9661fbcaf54e1639 SHA-1: 43c90b7e4ad0c7cfe773f372e5c43a2f4a0b6c10 SHA-256: dc72d8bc31b84d62b02f6882d3777b566d1f43d0d891c168f8ac9c21aefd185e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm designed to lure users into installing browser extensions or updates. The embedded URL `https://pelibifir.ru/wix?keyword=stuart+little+pdf+free+download` likely serves as a redirect to a malicious site. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=stuart+little+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/ponesigis/ejbQQX8/wwe_2k19_universe_mode_tag_team_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ahjjcjj/xunusapafezupa.pdfIn PDF document text
    • http://parkingtest.xyz/96543807668nrym3.pdfIn PDF document text
    • http://aazzzry.space/batch_file_for_loop_example_multiple_commands0bp6e.pdfIn PDF document text
    • http://theharaka.online/walmart_photo_prints_couponmphhg.pdfIn PDF document text
    • http://fherixq.com/bohemian_rhapsody_sheet_music_piano_solo_free06bo4.pdfIn PDF document text
    • http://gemunoz.iblogger.org/nctest_admin_guide.pdfIn PDF document text
    • http://jegepev.22web.org/ancient_history_quiz.pdfIn PDF document text
    • http://doordash.link/741913641195l3zr.pdfIn PDF document text
    • http://kartaidatodemeleri.com/23289592295b2gmx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d3d676-f95c-43e4-8ff3-f7a712312208/wakurivodanonemavafat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223fba1f-9146-41e6-87c4-7c41a13fdf83/16425344431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a839c2-d8cd-4530-af15-560e37cdf431/suzuki_violin_book_6_song_2.pdfIn PDF document text
    • http://fejiremow.epizy.com/98593573026.pdfIn PDF document text
    • http://wigamewekafon.rf.gd/bioetica_definicin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43eaefa5-2f72-4f03-ba59-dbb4bc15ebd9/best_fenix_6_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e26b332-e5b1-4637-821c-f1e7a4d0ffac/fisewe.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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 5052 bytes
SHA-256: cb97108e3f5dbeb15b44b950a30200981c675b9378133493b044667c621110cb
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10484 bytes
SHA-256: 4802f049caae0a1031464c3f8dc2af84523c96d0ad14e865d15af1586b1fd874

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