Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbb9779aeff09eb…

MALICIOUS

PDF

70.2 KB Created: 2021-03-14 08:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 594248dba6a81289df766d51cb1f8b8c SHA-1: 268d126b37f32a6ceae5b171ea2b6ff2208728e2 SHA-256: 0cbb9779aeff09eb9e53fd278b9672e716fdb794b89f556985797fda48b5d6a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host phishing or malware distribution pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=sharp+alarm+clock+with+usb+and+outlets PDF link annotation
    • http://lnstagramcopyrightmanagement.com/59845789189ehk8p.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/45300971208.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/professional_development_plan_sample_for_nurses.pdfIn PDF document text
    • http://wizagulonas.22web.org/96552523823.pdfIn PDF document text
    • http://superheatbelt.xyz/deriwabaxegesojumakenu14ldh.pdfIn PDF document text
    • http://snatural.space/275880404111surx.pdfIn PDF document text
    • http://aazzzry.space/vekerikaxenoz8mqnt.pdfIn PDF document text
    • http://ellmax-site.xyz/what_stocks_pay_monthly_dividendsdjojx.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/a2b18d40-b282-4f3b-b22b-09d8590001e6/why_is_my_samsung_phone_charger_not_working.pdfIn PDF document text
    • http://xisomifufob.epizy.com/jatog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f41d69-4840-47c5-bb33-5b280b0ca699/how_much_do_corporate_lawyers_earn_in_london.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56668d1-bfce-46fd-938b-c476c2e386b8/books_to_read_if_you_like_devil_wears_prada.pdfIn PDF document text
    • http://setixebasedi.epizy.com/62217907730.pdfIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_d47bb2da851b4273b756876fa5152401.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7894138-39e4-475f-89fc-3ef6ec9cab71/basic_list_of_irregular_verbs_in_english.pdfIn PDF document text
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_e51746ddac434e68910fc11f9c792f1b.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ea0ae9e852fc42199e462d9b78478d5f.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_cf68b97975a54107ad39e8025105f76d.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_fb793ce1a1604595b44532c704df4758.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/what_causes_commotio_cordis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea970fb-4d3c-401b-b9ce-77c1822de547/can_you_get_roblox_vr_on_ps4.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/xotexipowifadazixasujezi.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/how_to_shut_off_rainbird_5000_sprinkler_head.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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 5712 bytes
SHA-256: 9287f740d8bc8f0b1112a8d037bdaed4dcd3c49a8655ff7d0ffa0917e69398e8
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 10044 bytes
SHA-256: 014256dd13757e032f3e3497151523b474c8833987c02e6d0be76337e270625a

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