Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8df42654b1f6b6…

MALICIOUS

PDF

105.1 KB Created: 2021-06-14 09:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9744c1f2c230c4c2450bc6b888b204 SHA-1: 127830eaf7fb0616c254d9065d4d9cf5346d7943 SHA-256: 9c8df42654b1f6b6be5871880161a4273be9546155a0542ca7207ceb8f4f8af1
134 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or malicious redirection. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'PDF_SEO_LINK_FARM' heuristic suggest the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=amoeba+sisters+cell+specialization+worksheet
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/99faeced.pdf
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/falepag.pdf
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/nodedalori.pdf
    • https://tusejefil.weebly.com/uploads/1/3/4/3/134320171/jefewukevel-kipuxuxukaza-tibug.pdf
    • https://poxixarusel.weebly.com/uploads/1/3/4/1/134131789/zivizokojope.pdf
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/metusozizenevo-lonumorub.pdf
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/5177766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff30abdc-b40f-4a53-8965-404473fcb74c/roomba_980_costco_canada.pdf
    • http://vogivakazela.pbworks.com/w/file/fetch/145277997/teds_woodworking_plans_torrent.pdf
    • http://vepexiritab.pbworks.com/w/file/fetch/144996774/don_quijote_dela_mancha_vicens_vives_epub_gratis.pdf
    • http://sovuwin.pbworks.com/f/75630187390.pdf
    • http://kunixove.pbworks.com/f/61316652541.pdf
    • http://xojifot.pbworks.com/f/64036657742.pdf
    • http://nowefuro.pbworks.com/f/domain_search_shopify.pdf
    • https://uploads.strikinglycdn.com/files/645e73ba-b398-47a5-a921-d521a296d54c/3417268601.pdf
    • http://nixefijevumu.pbworks.com/f/abc_coloring_pages.pdf
    • https://uploads.strikinglycdn.com/files/61c25580-2d6e-4aeb-8800-2e35a696e016/whats_the_healthiest_thing_at_sonic.pdf
    • http://suniger.pbworks.com/f/criteria_and_constraints_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/97763df2-1e82-4509-b1a1-3092b0423ad8/vafixemewu.pdf
    • http://dupalalo.pbworks.com/w/file/fetch/144728967/toweros.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ebb.bin
581ac75883a9ac26cb00b19d7f16537a14c4d8696480ce2b00cd24dfe66bb19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBB 5508 bytes
font_01_sfnt_off00017161.bin
1b10ae882ada62d8e1eadebbd3206c163a8b83228bdeae8d3f7511ae0daa93b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17161 10912 bytes

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