Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6984e58001cc87c…

MALICIOUS

PDF

89.8 KB Created: 2021-05-21 13:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81f93a94c1782cddca578d65edc9df6e SHA-1: 7309ba55ebaec5567bfe8ce4c7073752de6f9fab SHA-256: d6984e58001cc87c7991d6f8f7ba075264011faad5a725feef9607a5a9441a1c
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and uses an SEO redirector, specifically pointing to 'https://kuzutuzo.ru/strik?utm_term=pou+gratis+descargar+ahora'. The document body, though partially garbled, contains text suggesting a free download lure. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/strik?utm_term=pou+gratis+descargar+ahora PDF link annotation
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/bd952f.pdfIn PDF document text
    • https://likasitazebiw.weebly.com/uploads/1/3/4/5/134594682/6822554.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/segewanomunebudi.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/jasipefulaxiduj/1774163279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8551dff-4871-4d2b-9e1d-e1afdb179d4a/manual_de_la_nueva_gramtica_de_la_lengua_espaola_2011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d4e7ed-d288-41a4-a032-ccac8d30f0b0/how_to_keep_your_volkswagen_rabbit_alive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5a7957-728b-4773-baab-91b9d1392462/22291008255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5165c646-4881-44d9-9bf9-aadc350fdb98/61185182005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d49c49-32a0-4bc2-9a92-86e30ad52529/social_media_marketing_strategy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/fexosidal.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/what_is_the_main_theme_of_emersons_essay_self-reliance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe66f12b-6ca6-4c16-8149-8b729bcb2b5b/wulemofupopu.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/34732108911.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/sazikizorapunifivuteta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0efa887c-8bd5-4cc5-a2c3-db6642bed4c6/frases_del_libro_el_amante_japones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45695c2-5cff-47f5-ba89-94c30a39d067/how_to_solve_a_2x2_rubiks_cube_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f0e4d9-d195-497f-9621-f2fb90903f29/resistance_band_workouts_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/tuvenazosajute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c9aa89-e1b0-49ec-8ce8-6c10560cc52c/91966815023.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/mountain_athlete_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a59f6e0-3393-40fb-82e5-8c9f8ed34920/garmin_astro_320_dc40_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be27721b-065d-4729-bd26-08d33fe5fb3d/first_things_first_cast_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/8053227343.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/movie_maker_app_for_windows_8.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_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 5168 bytes
SHA-256: dd49eeea18edadd08131919093f27aaedfaed49116c93d6f8ea1bdfe24424482
font_01_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 2504 bytes
SHA-256: bda46a189ab5ca82e9a2dfbdd44eacc5857f8d08cd207523bdafa5b6a969d3e3
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 12864 bytes
SHA-256: 699db57ffef1fbde43eea0b883e2f34ac7ee7b9de8eab42730110173fc58fa5e