Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91771f496832e3c…

MALICIOUS

PDF

81.9 KB Created: 2021-03-23 11:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17e73ddbede6fafd34356adf4544f44c SHA-1: ed011a6f57f7346fce5dd58ace0c8a30679317a7 SHA-256: b91771f496832e3cba317d372ff80a98c5ec523185bb186322123acfbac86e98
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=how+to+reset+brother+dr+630+drum PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447433/normal_6002133439b7b.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/gephiqN/bovada._lv_customer_service_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/wAjgegQ/skyscraper_meaning_in_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/OjgiciU/67506387607.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunivugame/eghFQ4V/295753103.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/kikodemomumi_tabadivu.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/uFgchee/moto_z_play_front_camera_not_working.pdfIn PDF document text
    • https://vimanofadubob.weebly.com/uploads/1/3/5/3/135304206/3147324.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/jiwezage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fe387d812dcf.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/4701137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5fd86608639c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_9f05d2b0ddb84d91a4647f76a52097c3.pdf?index=trueIn PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_53769d8746c74f818f4978e606186cc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/853cd165-08e7-4d4b-b26a-f00a13dd5bfa/can_we_become_a_secret_agent.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_9329a882c8f845d986bda59772c4888c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/037c28b3-5384-4ae3-abca-d3ec9c01b1e6/how_to_install_chrome_on_lg_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8097dc1e-65c0-46d5-bc4c-fa0ceb2f6abb/lanupopotafofeluta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f4dafd-d628-4a2e-b9f9-4b12cb7a7b16/37184686188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9bc0fc-9e45-4da3-bb39-7910276c2930/solve_quadratic_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727a48ac-b55f-4ab3-86a7-938a5f96ffee/15568186800.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_07429d4085004646a89327b684683703.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_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 5476 bytes
SHA-256: b639b4ca60eeba1da6c66ad966078ba7a808bcebb63473723daabb996207ecea
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 12076 bytes
SHA-256: bac05b26b517b46574a37350c918ce85c742dc68ba61ca2fef528e4589a9266d