Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf64206396e0687…

MALICIOUS

PDF

76.3 KB Created: 2021-06-11 10:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b40bb752e10f6c8729b2baa13b419e92 SHA-1: 26061a64c2fde3be388b3e40012dec14f46f3861 SHA-256: bdf64206396e0687facc56ad5ba3c1d13416be5ca01ee855ba44f4ac49bde5de
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 0.9991

Heuristics 5

  • 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 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://ketchas.ru/pbw?utm_term=balancing+chemical+equations+gizmo+worksheet+answers PDF link annotation
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/8189779.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/8974845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_604e0e38bb124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_60c2d248b5675.pdfIn PDF document text
    • https://bogatawokajo.weebly.com/uploads/1/3/4/9/134900502/c08be91d320c375.pdfIn PDF document text
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/wibuxagez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_60b7e8ef09160.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/9a544b0377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jareleleliz.pbworks.com/f/premiere_pro_motion_graphics_free.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144589539/44847540072.pdfIn PDF document text
    • http://tefesabiji.pbworks.com/w/file/fetch/144803820/99172914840.pdfIn PDF document text
    • http://siboxij.pbworks.com/f/lego_star_wars_the_complete_saga_character_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb39770b-a02d-4ee1-9b8b-912408400891/how_to_reset_fm_transmitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3840bb-ca74-4969-a8f9-d70ca775716b/bubitaluwabukisiza.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/f/bubebolivelo.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/30387890962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75b32a9-ffa2-4a83-ad09-8bcc545346f0/quelle_est_la_racine_carre_de_720.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144604290/41980562680.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144468477/2.3_calculo_de_integrales_indefinidas_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91aa587f-7b3c-481f-9155-1d06cf71b30d/wunexafovewodonojelemawo.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/f/ruluka.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/vumuzomatolonez.pdfIn PDF document text
    • http://junerew.pbworks.com/f/28823151365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9673aa-58d6-4310-8ee1-5943b52219fb/which_protocol_is_used_for_video_conferencing.pdfIn PDF document text
    • http://koruzepuza.pbworks.com/w/file/fetch/145125810/periodic_table_download_hd.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 5596 bytes
SHA-256: 225e5c2cbdc1aa854f1cc36bf483e1395dd78a354cb0ccf84baa3bd5593bd2a5
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10764 bytes
SHA-256: 4345b7d98d0bf80c56d3c65caf122252cd3d55abde38e8f2c5a7cb05048585d4

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