Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbf5881a7c371c7…

MALICIOUS

PDF

72.4 KB Created: 2021-02-28 11:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 61aa5c19aec14a9383c7f86a768d7d2a SHA-1: ffe269939745c6dd196afe86e799d16e890cb678 SHA-256: 8cbf5881a7c371c7c5e8a95557d4e438f6de40166666fbb9e6e6f7188b694485
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on disposable hosting to obscure the final malicious destination.

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://jottigo.ru/wix?keyword=mistletoe+lyrics+jb PDF link annotation
    • http://bigowet.xyz/forgotton_anne_train_station_walkthroughcaw87.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/EOjg5hc/21934335688.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/ihbjhgf/cover_fire_offline_shooting_games_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5fe95fd164bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_6019d624ed60d.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/gg1ijnw/superhero_car_racing_toon_robot_car_transformer.pdfIn PDF document text
    • http://vir-tus.com/kathy_rain_ios_walkthrough5nzcx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fc5ec7071a57.pdfIn PDF document text
    • http://vilopeg.xyz/rolexeralubogimovumj24rs.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/j9Djac1/51932229824.pdfIn PDF document text
    • http://menformula.xyz/43913113101befg3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_5fe9c5a663c57.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/l9hiSIH/2092690903.pdfIn PDF document text
    • http://help-igcopyright.xyz/ranked_voting_calculatorgw0wv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makakanow.onlinewebshop.net/the_lands_of_ice_and_fire_world_map.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/shotgun_choke_notch_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/27903047736.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/durug_bhilai_le_cg_song.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_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 4904 bytes
SHA-256: f3279dad4625c7e2504ef478eec4fbd3592f63d608e9fb3b3f1456e22496c936
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 9888 bytes
SHA-256: 37970c21e82289c24b4f67bbb8d62b2205bcea898629f7a35d23bf889dc9e11d

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