Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf205b9827d9831…

MALICIOUS

PDF

70.0 KB Created: 2021-06-15 10:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f0152e29394121aec4a8de651863d15f SHA-1: 496850a95ca998867b50a843385403ec91084e28 SHA-256: fbf205b9827d9831ca2f908a1fdce72304b5c12f7190bd40462539ba4e4f4955
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. No scripts were extracted, but the primary attack pattern involves directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://ketchas.ru/pbw?utm_term=hystria+rotation+bdo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366676/normal_602640f4637d7.pdfIn PDF document text
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/midaduwotizuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_60bdf63f7dcb6.pdfIn PDF document text
    • https://fuwivofopotafuj.weebly.com/uploads/1/3/5/3/135388640/gikani.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/wodozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronojew.pbworks.com/w/file/fetch/145003425/objective_agronomy_thava_prakash_download.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/90953470299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435e6e98-7722-407b-9e1b-c7d7d492fc53/sululekow.pdfIn PDF document text
    • http://pibadaro.pbworks.com/f/crafting_dead_pe_addon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5517c3-2df9-4a87-bd66-73a7d0720cfd/nefulonofoledobelexabixij.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144978609/14441680245.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/labikabadubogika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d532dc6-8a2d-4a0f-aecf-79aef541be83/getobovobazugasibi.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144446442/adding_dissimilar_fractions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29709d2-8c0e-4f27-94f0-121c5b2cfeca/72687018509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3945b1e9-a9e1-4303-ace0-ef892dc05bf3/zijosarusixofa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 4992 bytes
SHA-256: 925350c5f2411c8c6dbabeaa47f906f7a22fff679ddd009830cf3a2e288378ff
font_01_sfnt_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10688 bytes
SHA-256: 8ad87c733af5e7c71cc0a2a130d57572436e8aff8859446bb69f1bfa8b9dfbd3

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