Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff7711cf7995db3…

MALICIOUS

PDF

73.5 KB Created: 2021-05-16 01:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f1a49b1ab56bbacd23a4057392cda99 SHA-1: 138fb2fa3a3e9149196b0461bae3f021d5a2b05e SHA-256: aff7711cf7995db309d1fe22fbba845358289c15e6b3d9880daf4327910fd167
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 0.9993

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://pelibifir.ru/strik?utm_term=how+to+sync+ceiling+fan+remote+harbor+breeze PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6056b5fc26513.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/39a1a181c2.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/advertising_s_fifteen_basic_appeals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_603ff7682c6c7.pdfIn PDF document text
    • http://gouliwer.online/what_is_a_white_paper_formatewbcu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394073/normal_60094ae1c70ab.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/dfd21fd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_60480c5ca1f08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5ff4373d73baa.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/hotel_management_f_b_service_book.pdfIn PDF document text
    • https://fonuwinozizanam.weebly.com/uploads/1/3/1/4/131408397/8219783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370073/normal_6007f3309acc6.pdfIn PDF document text
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/foludal_lasimep_nopubifazebive_fedumodeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_605124789cb0e.pdfIn PDF document text
    • http://streamsweets.com/58160394448ibou6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_602c4ff8568f3.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/b1ac2d06-05ae-4cbd-9a0f-e6a386767d8d/sasela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fa7e2a-82f3-428b-8249-a760a9f31ad2/jeep_grand_cherokee_transmission_problems_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57eb914-eff3-4839-95cf-b31404a5e52b/rujuripagegovuvalogel.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/mgr_university_b._pharm_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34bfa1e-ac1d-4bf1-9b55-fd2c96780566/cules_son_los_sntomas_de_problemas_de_rin.pdfIn PDF document text
    • http://disoluje.myartsonline.com/coriolis_flow_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a89b494-bd97-464e-8872-cd64ee7b7346/what_is_the_structure_of_crystalline_copper_sulphate.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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 5640 bytes
SHA-256: dc42bad8df0ba09d602031d96cdab3cd81803fa561a5ed6ac090efa4c02d8bd4
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 10968 bytes
SHA-256: c7fd63218b41a54657d7485b40023f2240a32056fc0af30070be9211734eaf6c