Malicious PDF — malware analysis report

Static analysis result for SHA-256 852d419ba6bc000c…

MALICIOUS

PDF

82.6 KB Created: 2021-04-20 07:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 827a90cea1cd78b585361dfcb6e2d7c4 SHA-1: ddb36a3a3fe5ea66a46dcb8c0bcb5d7bcba9eb0f SHA-256: 852d419ba6bc000c74dd4ff8dfb0107d26e416a2e9db9c102a857ea87f176479
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=what+is+cloud+computing+in+ict+terms PDF link annotation
    • http://xenalebosob.scienceontheweb.net/foxoxigobozoxozodu.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/71004660684.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/ejbhcjc/knight_brawl_deck_card_list.pdfIn PDF document text
    • http://felagem.getenjoyment.net/systems_engineering_principles_and_practice_kossiakoff.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/musab.pdfIn PDF document text
    • https://cdn.sqhk.co/lewovazu/ieTXgjz/pioneer_archdale_nc_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/aqZggii/trap_dungeons_2_mod_apk_no_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/hiAQhjw/zezobobabudex.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/iHeEgiJ/wafezojol.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/hfsjfhi/lagu_asmara_nusantara_stafaband.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0ea39721-c72b-4803-a4ce-8a38381c4100/probability_and_statistics_for_computer_science_questions_and_answers.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_42c957325a4a45ec9546ff842d15cb48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/736321d4-b80b-4ffd-b213-37c9515316ad/96698471971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfeb305f-db4b-4f41-b06b-2d1cf3ef5130/sharepoint_2013_designer_download_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e791df7f-796d-4f69-b638-38b800242ec4/how_much_does_a_transmission_leak_repair_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18691eb-c06f-4824-89a2-b2f2a7f82264/vupagufomuwoluwa.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/aptamil_pro_expert_dm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72bdec7-0e24-447c-97a6-e99f42d8b007/95144298259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcec06c-1b97-4041-8da3-600304dfe727/what_does_the_number_808_mean_in_your_dream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681aec25-993f-438f-a902-90c5470ead52/63200088861.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_f89b03405f7447409ccc0896638aed8d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 5380 bytes
SHA-256: 98cdf05ad91d3e0d3bd5482b49068051aa23f8f0c73facfef8e96404ef0439f1
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10600 bytes
SHA-256: b7f79089defe99ce5ab4c569f135b4010a32450176003f677b6896522e056c10
font_02_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c