Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ae95ef3d7b2cb2…

MALICIOUS

PDF

83.4 KB Created: 2021-03-12 08:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8975a9926d5c7b46953801fcb7550d18 SHA-1: 92585da9d6faf60671e704672063595afb9e0275 SHA-256: 06ae95ef3d7b2cb2a104134060d87d8f2a1de3b3c61d82cc85ecb96c6ade5a32
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated to appear as SEO-friendly content, indicating a link farm or phishing attempt. The primary malicious URL identified is vilenefex.ru, which is likely used to host a malicious payload or redirect to a phishing site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=qualitative+data+interpretation+pdf
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/7df3147d.pdf
    • http://dosubodanes.mypressonline.com/93356830476.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/gerolunizuso-rawexa-nefema.pdf
    • http://tezoxefakalexo.sportsontheweb.net/kixuduvuzofokulowexosubug.pdf
    • http://sopugepibimel.mypressonline.com/no_fear_shakespeare_julius_caesar_free.pdf
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/vibosobalil.pdf
    • https://cdn.sqhk.co/jojikoxazew/eK4vG9x/at_t_smart_home_manager_not_working.pdf
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/a4e6c74e6.pdf
    • http://lilozekakotelup.sportsontheweb.net/mutadewogamemipokovolep.pdf
    • http://newipufisatag.scienceontheweb.net/how_do_you_unclog_a_hoover_windtunnel_2.pdf
    • http://retamos.mygamesonline.org/73739399744.pdf
    • https://cdn.sqhk.co/zuxatotukaru/KjaX6gd/27489355501.pdf
    • https://cdn.sqhk.co/xibetevoxaj/cmQiuXV/pinout_connector_usb-_c.pdf
    • https://cdn.sqhk.co/kezavilageg/jcOvhiU/jackpot_world_free_vegas_casino_slots_mod_apk.pdf
    • https://cdn.sqhk.co/jefigujaxev/g4z6iic/1926884525.pdf
    • http://vizilirudigub.getenjoyment.net/how_to_train_your_dragon_cast_characters.pdf
    • http://bidizujimon.getenjoyment.net/bloody_chamber_summary_and_analysis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_0eadd44c2a7f4d0d85cf534bab57ee2c.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_88f01b25272146a28b901aeff73920c8.pdf?index=true
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_0c2249d0ffd140aca2cf25630bb2e0c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fa1666f-2eea-4013-9230-dea198ea87e5/87782304896.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_ee3cd236b46946f29e26aef590ce2807.pdf?index=true
    • http://wugujub.onlinewebshop.net/articulo_4_dela_constitucion_mexicana_de_la_salud.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_bee33ab5cd444d61ad4c665668faacf1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96e5bcde-3ff5-4237-928f-09838d59af03/latin_word_for_writing.pdf
    • https://uploads.strikinglycdn.com/files/24479a18-8dc9-4715-9478-5c421ca229c8/zokugosutezitipeno.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_off00010b39.bin
468d479c998df00c246260e6c9b980992178e7d27c54d2a21a950a2f3d5e0831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 4976 bytes
font_01_sfnt_off00011c3a.bin
065ea40cfae8660b1cf878aa65eae37e47ce4f13bc0f274c904a4c15106f6db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10436 bytes

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