Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a31374e2bf65e4…

MALICIOUS

PDF

123.7 KB Created: 2021-06-14 17:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b2aeec7bf14a2ce254b8cec7945a747b SHA-1: ca233b6332c211396f50b43c29076fd20c0cf51f SHA-256: 29a31374e2bf65e469e12d9ee5889628d5144ee12820ba4d7344e170c877a05b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, and one suspicious URL (smidgel.ru) that is likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://smidgel.ru/pbw?utm_term=search+for+truth+bible+study+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fcdaa1490d84.pdfIn PDF document text
    • https://wozukofa.weebly.com/uploads/1/3/2/3/132303282/f03c06a9440e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_60671ff976696.pdfIn PDF document text
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/3ee451e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600cb2774c911.pdfIn PDF document text
    • https://zupitexugavasol.weebly.com/uploads/1/3/0/9/130969618/vojir.pdfIn PDF document text
    • https://sizosunobefema.weebly.com/uploads/1/3/1/4/131453016/ripazasobozifeput.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_602171eeb7aef.pdfIn PDF document text
    • https://ketibavobatuver.weebly.com/uploads/1/3/4/8/134849788/5fa28015e20.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/wudiwu-voruvurez.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/c6e6bb0300ae.pdfIn PDF document text
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/katevanu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5ff1b19f38041.pdfIn PDF document text
    • https://pojalizug.weebly.com/uploads/1/3/4/5/134591246/dikukitexisu-fejivaki.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/78e33440-0256-4052-9dcb-46634f89d25d/el_alquimista_libro_completo_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb21e89-cd20-46dd-bf35-39cc5aa362a7/lipafebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0bd9a9-f0d0-4062-96b9-e58b0d09a039/z_score_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b017c0-6e55-4eec-adde-7a9e022f6d5e/premier_protein_shakes_and_lactose_intolerance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19d21b3-47f8-438f-9b77-81f1eee500a2/sudosovez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4481ebcf-a43a-4e4f-a9de-b7e96540f02a/edipo_rey_libros_en_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9755083a-6f0c-4cdf-979f-46fd06042a0b/to_be_a_slave_julius_lester.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba54021-cd88-46f2-83b4-073657c20126/xajezupanot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2423c939-ef30-4497-a4c4-36cbc57afcbf/bodimojafuzewusufapiwa.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_off0001a5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5AC 5588 bytes
SHA-256: 415a5c418d5235b54017538c29ebb166db2f95f339d10a47b5d0240375d9dbe3
font_01_sfnt_off0001b8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A6 11764 bytes
SHA-256: cd551098af926c750768b1b32eea20f05a87307c1b6e6599000199a349ef8874