Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a79058797830a2…

MALICIOUS

PDF

70.3 KB Created: 2021-01-12 14:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6bb3197ad1363c0da521544632952e79 SHA-1: e620340e88b919f820066f524182cbedb534fa49 SHA-256: 91a79058797830a29a8ec8f17a698e9d10b3922a496f90ea5e22367142d7c6dc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or redirectors. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of UTM parameters in some URLs suggests tracking or redirection to specific malicious landing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://traffset.ru/aws?utm_term=bartaman+patrika+today+all+pages+in+pdf PDF link annotation
    • https://site-1173903.mozfiles.com/files/1173903/descargar_best_sniper_shooting_hunter_3d_hackeado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5fb2cfda687f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5ffd0a4648771.pdfIn PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/cat_jumper_starter.pdfIn PDF document text
    • https://site-1181045.mozfiles.com/files/1181045/iit_roorkee_logo.pdfIn PDF document text
    • https://site-1178320.mozfiles.com/files/1178320/free_cute_wallpapers_to_download.pdfIn PDF document text
    • https://site-1174856.mozfiles.com/files/1174856/pusadesopigisitob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/fortnite_aimbot_free_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/65524001401.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/dante_s_inferno_animated_movie.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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 5576 bytes
SHA-256: c6cda4b1bcd9dacfca21eaccd6ff5cac18395b7b957c105039d8aa8832b92c7c
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10564 bytes
SHA-256: 5acbe3f35890df9253b2a3bdafc18e8b9e4c1e7b8d03388f1580a2fe2ba8b883