Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b58792dfee432…

MALICIOUS

PDF

70.4 KB Created: 2021-04-03 22:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7993eb824bec488b582dc8465642cb SHA-1: 20faa5e6fcd8d8cec80bc8602903b00ef8b1fbaf SHA-256: 984b58792dfee432c10793caefe097c32267a71c589bbe296f63ff486630ec6f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to potentially malicious domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=algebra+with+pizzazz+pdf
    • https://cdn-cms.f-static.net/uploads/4479675/normal_60237384b5aa9.pdf
    • https://cdn-cms.f-static.net/uploads/4486199/normal_60498581acdab.pdf
    • http://ch-bewertung-2888.xyz/watch_terry_pratchett_movies_online_freettdme.pdf
    • http://tdsevsvet.ru/40147250566fzklz.pdf
    • https://cdn.sqhk.co/zapusukajev/hJ7jfpL/pencil_drawing_images_easy_girl.pdf
    • https://cdn.sqhk.co/lelabepena/haT3gjt/50777887799.pdf
    • https://cdn.sqhk.co/xaranoraf/difgjig/14016715370.pdf
    • https://cdn.sqhk.co/tuwetebep/ia2b5gh/luvomufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xijimuwupiju.epizy.com/88391668022.pdf
    • https://uploads.strikinglycdn.com/files/632a9fb6-cacf-4a1a-bbff-143dd7292056/63093080564.pdf
    • https://s3.amazonaws.com/jojitagifuva/thirteen_reasons_why_season_3_episode_9_recap.pdf
    • https://uploads.strikinglycdn.com/files/d622dc7d-429a-4e3c-9018-5197d557136d/what_is_meant_by_reimbursable_expenses.pdf
    • https://s3.amazonaws.com/fofeguj/astro_a20_xbox_one_wired.pdf
    • http://gedesopow.rf.gd/34431638176.pdf
    • https://uploads.strikinglycdn.com/files/00f2359c-16e3-4550-bffc-c025dc3401dc/why_is_my_hitachi_tv_standby_light_flashing.pdf
    • http://kalogoraretupo.epizy.com/movie_tamil_free.pdf
    • https://s3.amazonaws.com/wefadep/what_is_the_best_treatment_for_metatarsalgia.pdf
    • https://s3.amazonaws.com/woberiz/banjara_punjabi_movie_filmyhit.pdf
    • https://uploads.strikinglycdn.com/files/62f4af4c-84a9-4517-bdb0-7f14f833abbf/monufu.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_off0000d3ab.bin
b9c3e86c4c972515a9ca88488cf221a27ddf338f5cf7cf75c63f47bbc65a977d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 5396 bytes
font_01_sfnt_off0000e618.bin
6baec6a607c3e5f57467728d9771088f922cbf84880cbe81449e4882aaa4b4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 10884 bytes

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