Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb1ee09ab3ceb68…

MALICIOUS

PDF

98.6 KB Created: 2021-06-11 05:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58d56f93d93a46ef5dbcf78c3db39e82 SHA-1: f264298c5cf1f48122c8a5c4fc0b33f5aefcc501 SHA-256: 3fb1ee09ab3ceb68a2a2469a599ddd14495c004529ab36e6084fabfeca475be3
186 Risk Score

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 0.9976

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://nomylo.ru/pbw?utm_term=intermediate+1st+year+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384469/normal_601a3dc24f405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_60434e40143d4.pdfIn PDF document text
    • https://sozeberanula.weebly.com/uploads/1/3/4/7/134774269/medonaguweteko-gegone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5fec15606444e.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/jelom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_60c1f4d8f31ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5feb56d9a6707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_6004edb149684.pdfIn PDF document text
    • https://risixugetiso.weebly.com/uploads/1/3/5/3/135317557/lanogaxusasim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_6041a27425464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_602c4ababf26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_60367cefd2d87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nimogomaw.pbworks.com/w/file/fetch/144969246/fmt_reddy_download.pdfIn PDF document text
    • http://guvevef.pbworks.com/f/finemobip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779b615b-9f68-4a86-a99b-1472b4d312a3/fujowifepaxiwuxokasevije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff68ea3-335d-4e95-aa2e-c6f80bb040da/46712772530.pdfIn PDF document text
    • http://veposasidot.pbworks.com/w/file/fetch/145084338/17776331501.pdfIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144423780/xerevesigudazegaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d27af14-a506-46aa-8f6f-7419e2407b2d/suzapoledof.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/nigavajejej.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/descargar_halo_2_para_pc_gratis_en_espaol_completo_para_windows_8.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4c0438-1d62-4cd0-b82c-67803c200b1c/ramayan_chaupai_full_lyrics_in_hindi.pdfIn PDF document text
    • http://likanegi.pbworks.com/f/how_to_update_google_safe_browsing_service_in_safari.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5308 bytes
SHA-256: b146e36f5f302901185afe3c466f213115adfaa6ed44d021530be78dd2f9835a
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 22828 bytes
SHA-256: 52b1ec6f33b16972b65a67db26151ee3efd35dc6b15c386f86db7766b411a3b4
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 11256 bytes
SHA-256: 366d9bf212000f83ef64a68e6c9ea53fd042a6503f9e5d9e43e7a38fa3e760da
font_03_sfnt_off000158dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DC 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
font_04_sfnt_off00016df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3