Malicious PDF — malware analysis report

Static analysis result for SHA-256 9847648b3c588b19…

MALICIOUS

PDF

72.2 KB Created: 2021-06-04 06:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f81952ea765451167e072fe120a00b67 SHA-1: 8279a01756e310c49865689ab36a8628ce3c116d SHA-256: 9847648b3c588b1937d96d72fc0ade6229c497ce61bfe46660d2cb70c4509836
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://queure.ru/pbw?utm_term=dictionnaire+allemand+fran%25C3%25A7ais+pdf+gratuit PDF link annotation
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/voniguweje.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/1804509.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/xofopirenen.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/ziruxapofadugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601b94b6da271.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/widazapevakekupof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_5fe8278073880.pdfIn PDF document text
    • https://ziwarafe.weebly.com/uploads/1/3/4/3/134306838/forunafozumedonit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601681f9b0719.pdfIn PDF document text
    • https://netemadore.weebly.com/uploads/1/3/5/3/135306203/4458057.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/zawikisow.pdfIn PDF document text
    • https://waxipirugetaweg.weebly.com/uploads/1/3/7/5/137508402/jaxaz_lezuni_xamofufobebun_sunov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144493218/suma_de_vectores_por_el_metodo_del_triangulo_y_paralelogramo.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144419511/samsung_company_swot_analysis.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144448389/81225290691.pdfIn PDF document text
    • http://joxupakager.pbworks.com/f/99668433622.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144535167/california_driver_license_test.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/physics_for_scientists_and_engineers_6th_edition_tipler_solutions.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144580089/exercicis_complements_verbals_online.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 5656 bytes
SHA-256: 4d60c3d9ec8d7617a2046a9af908d047456d6852c6ab6d38f4d9800e8cc31fdd
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 12368 bytes
SHA-256: ca78c5adc31b02eeb16c5c847c611138f21b2b208888d76f31409b39a8261b0c

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