Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd2c2a767a80bb2…

MALICIOUS

PDF

72.7 KB Created: 2021-03-10 18:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cbf920441470acd07214de3c2334178 SHA-1: 3c26f07ccd0b3ec7972e282a78e2663bb7099715 SHA-256: 5cd2c2a767a80bb276973ebfb1cb8aa334e83a0690e5b0ce1ee162eff5ce4279
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, including one pointing to 'zajinet.ru', which is likely part of a phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/aws?utm_term=isaiah+53+explained+book
    • https://cdn.sqhk.co/pilimisoduk/deH0hdz/55715649305.pdf
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/lubajuvuzoxikin_taritaluv_vomusab.pdf
    • https://cdn-cms.f-static.net/uploads/4502336/normal_600d7d072c4eb.pdf
    • https://cdn.sqhk.co/reruzemafow/RrMhagh/slot_car_racing_sets_australia.pdf
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/9801224.pdf
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/sawaxoperuk.pdf
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fc7eb1abef45.pdf
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fe4d5cc17b41.pdf
    • http://nogefoxezegu.22web.org/susegofebexaparanom.pdf
    • https://cdn-cms.f-static.net/uploads/4482189/normal_602f4b427117c.pdf
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/083f18.pdf
    • https://cdn.sqhk.co/rumoligodo/fhhjjdf/dictatorship_vs_democracy_essay.pdf
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5ff10cddb840f.pdf
    • https://duxezixupedad.weebly.com/uploads/1/3/4/0/134095883/gitegetamapabonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://riberudedanute.epizy.com/social_science_class_10_mp_board_guide.pdf
    • https://uploads.strikinglycdn.com/files/c1f41a76-28d4-4ab0-9d05-e4d989fd730a/what_causes_density_currents_to_form_in_the_mediterranean_sea.pdf
    • https://s3.amazonaws.com/lusabifef/burning_sands_2017.pdf
    • https://uploads.strikinglycdn.com/files/ee8a2fc3-fd76-4efb-8447-9ecffa61d970/how_to_compute_maclaurin_series.pdf
    • https://uploads.strikinglycdn.com/files/d3db7bba-02e5-4482-b3d3-dc7f48f523d2/how_to_pray_for_a_good_spouse_in_islam.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/information_about_india_gate_in_kannada_language.pdf
    • https://uploads.strikinglycdn.com/files/8b6be216-ebf5-44c5-a654-3f4c3dbc8dd7/sevavomofivoma.pdf
    • http://bomemab.epizy.com/rikowubis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df69.bin
56ab79e5bfe9a771508c3cf216104a6c841fe0149a8147fa97be9b0c4c8520be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 5448 bytes
font_01_sfnt_off0000f1ed.bin
f00446cab92b0535573ba26f940c9ede75f54171efe6da155803b83de4308e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10336 bytes

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