Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dab23574e7beec…

MALICIOUS

PDF

80.5 KB Created: 2021-05-16 06:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 882a1709e45e21bc5bd9cf32c137e991 SHA-1: e32d564a0405e69279281fa4d016c77eb51e20e2 SHA-256: 23dab23574e7beece4e797057d7a6bdadfc6b67e7f4df64662a3079fff091a16
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains a title related to a common household task, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=how+to+remove+a+washing+machine+agitator PDF link annotation
    • https://noxaxubobef.weebly.com/uploads/1/3/1/3/131380993/4863026.pdfIn PDF document text
    • http://help-verification.com/baxipip4tnk.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/60887284440.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/metro_map_2020_download.pdfIn PDF document text
    • http://aov.one/apostrophes_worksheet_for_grade_4d3faw.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/ghBieLl/zombie_survival_build_and_survive.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/bad_words_in_english_list.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/a9f6212a1ccd2e.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/gijghih/buduginamozuvidelazozipo.pdfIn PDF document text
    • http://pollsexpert.com/rajotip6j84a.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/50bhdnk/save_the_light_switch_game.pdfIn PDF document text
    • http://markettop.pro/civil_service_answer_sheet_samplegr0rr.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/gangguan_afektif_bipolar.pdfIn PDF document text
    • http://sk-anker.ru/185725078986gka4.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/bgp_protocol_rfc.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/does_dyson_have_sales_on_black_friday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ranitirunom.myartsonline.com/hoover_wind_tunnel_rewind_uh70820.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_10ac0888d3da4581b3deb5065cfec49b.pdf?index=trueIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/nicomachean_ethics_sachs.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • http://visugog.myartsonline.com/what_does_sg_mean_in_golf.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_11700fb8d2d54cc3bc6ca46c02d8701c.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_086328611c1c4316b1b7464e58b9543b.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_d03d1cebfda94b82a2d464a1ea996e7e.pdf?index=trueIn 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_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 5292 bytes
SHA-256: 60ea1a9cfba387a3a63ae5f73aac59b65a5484e11b0140566a020428aec42b88
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 11012 bytes
SHA-256: d28c79178ddea2e4e24a869e89f4188be9b40af6dfb8946001c6c4b79c2baeaa

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