Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77c651b5efdcbf7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 00:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b3d45fabffcfc076b2d78a69fba7291b SHA-1: d097215cec8156e499e515d17b950ceb26ab671a SHA-256: c77c651b5efdcbf7162fe5425c2220d481bdb9de0451d80d956e0dd3573a396a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to compromised or malicious sites.

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://pelibifir.ru/123?utm_term=letter+k+worksheet+writing PDF link annotation
    • https://cdn.sqhk.co/zanudiwageg/0jijgif/entropy_piano_tuner_microphone.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/jjidHS8/send_bitcoin_to_wallet_cash_app.pdfIn PDF document text
    • http://creampiepow.club/troy_bilt_pony_mower_deck_removalg3rj4.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/bemugozibatisep.pdfIn PDF document text
    • http://wowit.pro/briggs_and_stratton_16hp_vanguard_engine_manuala2bbp.pdfIn PDF document text
    • http://retesopi.iblogger.org/so_sad_status.pdfIn PDF document text
    • http://smcjd.com/they_say_i_say_summary_chapter_4qqqi8.pdfIn PDF document text
    • http://gouliwer.online/surviving_sepsis_campaign_management_guidelinesqxlrq.pdfIn PDF document text
    • http://natiral.space/how_to_reset_a_dewalt_20v_batterydcvip.pdfIn PDF document text
    • http://kobasobapina.22web.org/33691192594.pdfIn PDF document text
    • http://makipoduzoru.22web.org/baixar_mapa_mundi.pdfIn PDF document text
    • http://vifumopexepazus.22web.org/gupor.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/1096604015.pdfIn PDF document text
    • http://opendouche.xyz/102112381536jr3u.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://jefelaxe.epizy.com/formal_clothing_online_australia.pdfIn PDF document text
    • http://daferavore.epizy.com/is_the_exorcist_movie_on_netflix.pdfIn PDF document text
    • http://xexasuwoxomiba.rf.gd/fmla_guidelines_for_federal_employees.pdfIn PDF document text
    • http://fabonek.rf.gd/ffxv_menace_dungeons_guide.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/fagiluxadojunaritexuge.pdfIn PDF document text
    • http://wudafozejuniv.rf.gd/byron_katie_jyn_worksheet.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 4592 bytes
SHA-256: ca5728da8159cd0ad8f36db4769e2fdf40011c362a2f08f68ee435597b911bc7
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10900 bytes
SHA-256: 63c03aac0d5765978ba37ffde56775e9f9b6c9d21871875ef9d8d758e598f118
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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