Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa1501a9fecb054…

MALICIOUS

PDF

76.6 KB Created: 2021-02-15 11:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 10108b8ec1d7f931afd73f06608e4347 SHA-1: a0a86b5ef823b390aeca78f8cf7aac05d342af3a SHA-256: 7fa1501a9fecb0546d79452163defeafe425d7867628fe693885d734a6215b51
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware installation. The embedded URLs, particularly those on disposable hosting, suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=the%20crucible%20act%203%20and%204%20study%20guide PDF link annotation
    • https://cdn.sqhk.co/wujamufaw/Q9jjjh2/black_friday_tv_deals_uk_43_inch.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/7lA5ghD/jofoxakagevododubiwejuweb.pdfIn PDF document text
    • http://welutotadaxol.iblogger.org/rojujadivasavuginiviru.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/phc6ahh/61712302589.pdfIn PDF document text
    • http://muvibigi.22web.org/27593211875.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/poguvelefa/pokemon_game_pc_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/6730363239.pdfIn PDF document text
    • http://rufejawat.epizy.com/fitch_report_saudi_arabia.pdfIn PDF document text
    • http://pageziwakuvagu.epizy.com/35113877106.pdfIn PDF document text
    • http://tepuvat.epizy.com/vande_mataram_song_information_in_kannada.pdfIn PDF document text
    • http://sejekaxupoze.epizy.com/antivirus_for_pc_2019_free.pdfIn PDF document text
    • http://vujesidewu.rf.gd/avg_antivirus_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/private_browser_pro_apk.pdfIn PDF document text
    • http://ratudafoxivux.rf.gd/party_invitation_card_psd_free.pdfIn PDF document text
    • http://wogafut.rf.gd/disclaimer_audit_report_example.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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5644 bytes
SHA-256: e56175f1426b6d8c8d4fbee56029800bee7e0b47e6fd8c37c704ec18dc7e9e6a
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 9844 bytes
SHA-256: 01555720ba44c9d1de4697fe24b4fe1d21836ea6747aa24bf62add490f482497

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