Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac021c7a5617af2c…

MALICIOUS

PDF

86.8 KB Created: 2021-03-14 17:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5557775a0fbc87c17e540acd73efe94 SHA-1: 9f00c77719e05287b5afa5e3bed61e02823aebb5 SHA-256: ac021c7a5617af2c66ed2eece16723d9d16b820fef73e6f8f98b4c3e8ee21d8e
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 0.9993

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://golowaki.ru/wix?keyword=plate+tectonics+worksheet+8th+grade+pdf PDF link annotation
    • http://bawazofo.getenjoyment.net/10851916104.pdfIn PDF document text
    • http://bawilidow.mypressonline.com/all_engineering_drawing_symbols.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/ber_social_media_zum_job.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_601395d9d25ed.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/pusiditabekulix.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/80241541456.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/best_online_data_science_masters_programs_india.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/wapebisabuxavojoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fcb7d85aa1be.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/dogivinajezu.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/zumadegolitupogatafifatav.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/organic_chemistry_volume_2.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/64918542775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_6046348eea549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_603b2d03af8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600fdf1f87808.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/55865771391.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/gadulelutepejanes.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/thinking_with_type_ellen_lupton_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_4330e2fe33ef4fbaa801b16b4b0228b2.pdf?index=trueIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/are_vox_amps_good.pdfIn PDF document text
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_0e0254b946d843d2be6dbeecbc1eb0dd.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_857496b2bc67486ea1149d55ab113ac5.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_d2db0af712164210b1fa139965434d65.pdf?index=trueIn PDF document text
    • https://045423f6-c0c0-4d84-ad86-85f1ea38791a.filesusr.com/ugd/738632_b7bac27967784904b39494757a20e65a.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_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 5768 bytes
SHA-256: ccbda8a5bb812c4fe5e0e085dc2cf046ef77b8a3f2ee3519ba650717b1b19f2b
font_01_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 10920 bytes
SHA-256: 4b35142450e80e0f29e737101cd13f0375a8eea8c3073e0afbe7e66b622eb205

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