Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4c236d5dfcd359…

MALICIOUS

PDF

78.8 KB Created: 2021-03-15 04:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9c55b95bc3d2a557c204b90897353f78 SHA-1: 930690b10aa51e15edde9c04ae645d02c742feb3 SHA-256: 9a4c236d5dfcd359885dd72dd13af67fb042429917505c645d93a1d158602302
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains metadata related to French grammar learning, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=learn+french+grammar+through+english+pdf PDF link annotation
    • https://cdn.sqhk.co/satijumok/ibFLihV/byzantine_empire_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fd7eaa48e6d1.pdfIn PDF document text
    • http://instapriz24.site/niruvozovufagovijixisafaw1r7dw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_604cda81971dc.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/IjjRQif/shark_dating_simulator_free_download.pdfIn PDF document text
    • http://velimogoliti.iblogger.org/number_line_1_50.pdfIn PDF document text
    • http://kidepokapila.22web.org/yaris_verso_repair_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fokaladanolo/gggieja/lunemimibigod.pdfIn PDF document text
    • https://cdn.sqhk.co/pelonulu/hcTgY8A/nosezip.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/QhhaiNo/escape_plan_2_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/jfieNbl/amazon_prime_video_apple_tv_not_loading.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/zib0haX/zatosuluvomatelopatupapul.pdfIn PDF document text
    • http://vamepabiresoriw.22web.org/sudanuvugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_6027212c16a4e.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/iaiehhd/microsoft_authenticator_app_play_store.pdfIn PDF document text
    • http://bossyonlinex.com/tengai_makyou_ziria_romf7cve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://banobozibijur.epizy.com/guidelines_dyslipidemia_2019_esc.pdfIn PDF document text
    • http://gizimup.epizy.com/vixogezidepuvose.pdfIn PDF document text
    • http://nametelival.rf.gd/78020895690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 5392 bytes
SHA-256: 88bfdabdc3ad41f6eee2bf4e98216f51da1a5d04af133da6c0d5beb3a0a4d0bd
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 11172 bytes
SHA-256: 3c12eebfeba622c636726e43bdf76746bc4ed9626cf59bcd8d94b97bbd63e491
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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