Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa3499fe165f6f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 15:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8a7e6d8c75db23ff1b456eeb74243b7f SHA-1: f264011a5aa8bbd3bb90f1873c809b9b5abf435f SHA-256: 66fa3499fe165f6f3c757365cef1c7e77c4ee9b543a462ed00b53812bf15e776
126 Risk Score

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 0.9996

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://golowaki.ru/wix?keyword=toshiba+tecra+laptop+user+manual PDF link annotation
    • http://davupopebuwiser.sportsontheweb.net/how_to_pair_doss_speaker_with_alexa.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/notadem.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/lakisetedexigok.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/luvenagapadapim.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/88159945925.pdfIn PDF document text
    • http://sukotisibam.22web.org/icu_medical_equipment_list.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/ziruwupijujejidoki.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/tafodusutobowuz.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/71405878665.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/firel.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/airport_job_offer_letter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jurizamumi.myartsonline.com/bragg_s_law_solved_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/girenizeputufasoweronazon.pdfIn PDF document text
    • http://tepaduvofevog.rf.gd/medinavol.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_346c1dbef43348729bebc258360c1e39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/bogezigejuxadeb.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/tratado_de_direito_penal_cezar_roberto_bitencourt_parte_geral.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_de7998fe58024ef8b7730335ffd36b38.pdf?index=trueIn PDF document text
    • http://zukeligo.rf.gd/95563280295.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/black_boy_haircuts_with_long_hair_on_top.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_f27a3665db514a1e927783b48ba53f63.pdf?index=trueIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_7841a38671cc404a8c007f36e4ce9667.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5260 bytes
SHA-256: f7c9f60c6213f53c635681fcd7afc6c859b49607e6528ea544d035a9880c1534
font_01_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 10796 bytes
SHA-256: 2a30e942f6132bfca1b3c98dd8f491edfe7f931539def7a95d39e37e89aa1b2d

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