Malicious PDF — malware analysis report

Static analysis result for SHA-256 066681495a9d0b8d…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 09:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4707c1a89bafd49fff95dbe3c9415342 SHA-1: 53bd2ffc6065e19c4b730c7aaa68850f572b6289 SHA-256: 066681495a9d0b8d8116d95d3ffe416addc4a02cbf1d3d89bd43b7f87ded6a90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nipisod.ru/strik?utm_term=do+it+yourself+home+projects+on+a+budget PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462093/normal_602711b3f03a2.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/heEG6hh/free_subscriber_sub4sub_and_channel_promoters.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/why_does_hopper_go_into_standby.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/eibnR3D/19552745066.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/WMgj5ii/bajonisutelekanupol.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/brilliant_pala_study_material.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fc679abb9344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_605376b9bde18.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/6ggpjgQ/25067889055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5ffe8c9b06372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_60075fce5f405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_7f9a2726cc9842359320ae532b5a7bb3.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_0d7183d29eb34328950c001bde497eb0.pdf?index=trueIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/85921622035.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_11582d93550448d9badf35a2751a57eb.pdf?index=trueIn PDF document text
    • http://girupesoja.rf.gd/vurafoxolosofuba.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_c05b8b4ff6f146918faf5cd743f46299.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a7bdd6-b800-47a5-acdc-2e28a77bc9bd/27021626786.pdfIn PDF document text
    • http://dekefolujif.epizy.com/60050965724.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/assembler_3_en_un_seul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9622eb-3d41-4532-832b-e3be23f9fc2b/is_a_dodge_charger_rear_wheel_drive.pdfIn PDF document text
    • http://lakutinegodoted.epizy.com/67837371767.pdfIn PDF document text
    • http://pivomowofafo.rf.gd/chikungunya_test_report_time.pdfIn PDF document text
    • http://zivexotafoni.myartsonline.com/vowosavi.pdfIn PDF document text
    • http://zajakitonen.epizy.com/how_to_get_paid_maternity_leave_in_illinois.pdfIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_7d258a8214f44ddb8fb5c2e35e331637.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 5888 bytes
SHA-256: 058203b6b7020e6021ae6ace3ac019cac28374b4398f6a0022a4cde8da02b8b0
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10972 bytes
SHA-256: 6cdd1c1d8ce8aec642521333bb2d26592ee835037ecb7afff9f73c803b747f65

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