Malicious PDF — malware analysis report

Static analysis result for SHA-256 884d7d4dc312ec89…

MALICIOUS

PDF

76.8 KB Created: 2021-03-07 06:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a3d8d4615eefaa5e9338f63a9c1e2a32 SHA-1: 4f77ef1779b431590e7361e20486352902b41a02 SHA-256: 884d7d4dc312ec89c060d0f6905eefe421db8c1a2358f4088b9548dd6de2bcee
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, including one that appears to be a redirector for a link farm, suggesting an attempt to obfuscate the final destination. The presence of external URIs and a link farm heuristic points towards a phishing or malware distribution scheme.

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://jottigo.ru/strik?utm_term=my+lg+blu+ray+player+has+no+sound PDF link annotation
    • http://istlan.space/miami_beach_police_reportssiku0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6039f2a550b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6040f3eec98c4.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/eQzjijb/star_trek_timelines_leveling_guide.pdfIn PDF document text
    • http://worldhold.online/kaliwudumavovejujipadojahpumg.pdfIn PDF document text
    • http://dkblogin-de.best/how_toyota_production_system_worksz0ojo.pdfIn PDF document text
    • http://storedubai.shop/cooling_tower_design_nptel9gvfn.pdfIn PDF document text
    • http://springtea.space/95941463552bihe4.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/rWif5ql/59873570751.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/how_to_get_a_self_cleaning_oven_to_unlock.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/hereditary_script_font_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/hhjggjh/82252292348.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/i9PZlb7/real_football_2020_gameloft_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/AjdhhXp/fire_and_glory_ministry.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/2730ac50-b432-4805-aefa-db244bc621fe/25944175145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52b31d1-2306-4e2e-aafa-f917e6be6c80/how_does_the_bushnell_phantom_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bc7021-5f8e-4098-be5a-65fbb9bd1dca/pudibiwulekexifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ff0465-c884-442b-b9d8-261420359511/zokitiwofesiz.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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 5468 bytes
SHA-256: 3925e53e8a04d2adaf3998aa33057daa1ce5d274f362c39795dd42728bd13662
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10480 bytes
SHA-256: 1406a672ce09874d86f8f45efe800a22231059a9bd3cd766bdef42aa7788aaac

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