Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99fbc2baab8c5ed…

MALICIOUS

PDF

84.4 KB Created: 2021-06-11 01:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4e4119e8c63573cf6a45070b50e9cd0 SHA-1: e4c65cc6c937bed399390634cd679e3b660321dc SHA-256: c99fbc2baab8c5edb22e17fb0a2146ad4d347ebd871fe8ead92e38e31aa6f6ed
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites designed to host more malicious content or act as link farms. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a phishing or content-luring campaign. The presence of a URL related to 'watch downton abbey season 1 123movies' further supports the lure aspect. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=watch+downton+abbey+season+1+123movies
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/8567746.pdf
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/bijorupefeteliz.pdf
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/dumepag.pdf
    • https://static.s123-cdn-static.com/uploads/4473388/normal_5ff972b840297.pdf
    • https://cdn-cms.f-static.net/uploads/4450506/normal_604ca0d74e9e4.pdf
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/foduzevevu.pdf
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ff3a7f11b79a.pdf
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5feb97804b4a1.pdf
    • https://cdn-cms.f-static.net/uploads/4426942/normal_6055956ecdb4a.pdf
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/1734849.pdf
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/zurukor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5a58a999-a2ce-486b-b850-d360f47bdfae/how_to_start_a_wordpress.org_site.pdf
    • https://uploads.strikinglycdn.com/files/91b92bbd-7f42-4d45-b4f9-6f4ef365180b/lizipimefabasujaj.pdf
    • https://uploads.strikinglycdn.com/files/17b55c74-285b-4e22-a722-a6325040d58a/how_to_update_vizio_e470i-a0.pdf
    • https://uploads.strikinglycdn.com/files/5f986db5-8d8c-4c04-b634-36794f64791a/julius_caesar_death_speech.pdf
    • https://uploads.strikinglycdn.com/files/341e18df-7121-47bf-9ea2-4a680e1d98dd/are_speed_queen_washers_worth_the_money.pdf
    • https://uploads.strikinglycdn.com/files/bece95c2-c491-4e46-acc3-4ce9b3ec5a82/dan_kennedy_marketing_books.pdf
    • https://uploads.strikinglycdn.com/files/82b3cfa7-731b-4e7a-b7ed-5eb3bc4fe0d0/los_juegos_del_hambre_sinsajo_parte_1_completa_en_espaol_gratis.pdf
    • https://uploads.strikinglycdn.com/files/c22876a7-2daa-4c2d-90f8-b52193eac1fc/american_red_cross_online_first_aid_renewal.pdf
    • https://uploads.strikinglycdn.com/files/78926c8d-5bbe-4d5b-a254-89796ccec74f/totad.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_off000107c6.bin
b24a8719cee9e25ffdd5ad293b3ab0297bf37b1ec3b509e4e72355b24654486f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 5804 bytes
font_01_sfnt_off00011b8a.bin
0003272a33e77be23d2910da2373f0c79e3756f4cff900fc22c18b62b9fa516a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11872 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.