Malicious PDF — malware analysis report

Static analysis result for SHA-256 524e76f615a17e71…

MALICIOUS

PDF

77.9 KB Created: 2021-05-13 23:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 934834ff3698d3fbb32f8ca7ab12dcd8 SHA-1: 21cbcc073d1b28e1ce60d96056713816f61ec8a4 SHA-256: 524e76f615a17e71d634a51d21f3e2fd2eafa9a0347a1f940e294a505e3d665d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though partially corrupted, suggests a lure related to woodworking, but the primary malicious activity appears to be the extensive use of external URIs pointing to disposable hosting domains, likely for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior.

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://jumiwimov.ru/strik?utm_term=how+to+achieve+a+whitewashed+look+on+wood PDF link annotation
    • http://totalcreditcheck.info/hamilton_beach_oven_with_2-slice_toaster_comboocndr.pdfIn PDF document text
    • http://lazinuno.scienceontheweb.net/bisesuguliw.pdfIn PDF document text
    • http://losmopaka.site/brian_carn_gayf3jr1.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/Vjcjhhi/switched_at_birth_season_1_episode_2.pdfIn PDF document text
    • http://bonuwefuganagus.22web.org/adobe_reader_download_free_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/bWhadxp/1222735590.pdfIn PDF document text
    • http://tapopapebesawu.getenjoyment.net/29159464902.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/star_wars_lost_stars_characters.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/5670e009-3398-41d1-8110-19ac3d257948/twilight_saga_part_5_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f99828-4fe8-47c8-ac05-a01576c5c7a9/97469223329.pdfIn PDF document text
    • http://vogonadebemumox.epizy.com/momovipegobokun.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • http://mizetum.onlinewebshop.net/workbook_for_auto_mechanics_fundamentals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40de1a06-ae2f-4884-b0bd-edf93c9a7406/john_deere_snowblower_attachment_manual.pdfIn PDF document text
    • http://mivurukelino.onlinewebshop.net/half_wave_rectifier_circuit_diagram.pdfIn PDF document text
    • http://birifamabaxum.rf.gd/raj_bapna_mind_power_techniques_in_hindi.pdfIn PDF document text
    • http://katujomun.rf.gd/filter_cross_reference_guide.pdfIn PDF document text
    • http://wofavum.myartsonline.com/jurnal_teori_budaya_organisasi.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_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 5108 bytes
SHA-256: c46ee0ee7a73b96bf3d66fad7a5b6cdd53e22615f6470c46da3e6186a74af895
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 11272 bytes
SHA-256: fa3f135c669d34a396a482e76d4ed4797bccdaf560b020ba1717a0080844a317

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