Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdccd2b8877984d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 22:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f39a2c682d7b44aaae9e25752ae2efa SHA-1: 9b8d5f38d2c8fea0117022af592f3360c1a2b091 SHA-256: 8cdccd2b8877984d293f70d3f04bbee31d5957f205c6a7519749056ffb6f809d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a suspicious URL like 'https://crophysi.ru/strik?utm_term=que+significa+cuando+los+ni%25C3%25B1os+tienen+ojeras' strongly indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=que+significa+cuando+los+ni%25C3%25B1os+tienen+ojeras
    • http://xugerovogubex.22web.org/22681612348.pdf
    • https://cdn.sqhk.co/wimedizi/jhhcjfc/90723283940.pdf
    • https://burobedulaku.weebly.com/uploads/1/3/5/2/135299914/xidamav.pdf
    • http://nakozovuzu.22web.org/55605110141.pdf
    • http://manubazarexom.22web.org/how_to_increase_file_size_on_mac.pdf
    • https://cdn.sqhk.co/tovipovo/CghnOn8/pokutez.pdf
    • https://cdn.sqhk.co/dikabopagesi/buiguhO/toca_life_city_apk_1._3_free_download.pdf
    • https://cdn.sqhk.co/kegufamop/wib8giB/85575061214.pdf
    • http://ruroraratotu.66ghz.com/new_dj_song_pagalworld_2018.pdf
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/tovuvujoderijizi.pdf
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/c27dc68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xezujuwevan.epizy.com/bhaiyya_malayalam_movie_video_songs.pdf
    • https://s3.amazonaws.com/vunizi/84760811166.pdf
    • https://uploads.strikinglycdn.com/files/efef6ea9-7770-4e70-b2f8-c21acaae3876/sweat_app_review.pdf
    • https://uploads.strikinglycdn.com/files/53d62e68-8986-452e-b94c-caf5aae3f3e8/gofefofiwamipafufufomu.pdf
    • http://fojurerofa.epizy.com/biografa_de_anaximenes.pdf
    • https://s3.amazonaws.com/nagev/patent_search_and_analysis_report.pdf
    • https://s3.amazonaws.com/desekusoxi/hazardous_materials_training_test_answers.pdf
    • https://s3.amazonaws.com/bitajemisajoz/cen_tech_multimeter_61593_manual.pdf
    • http://boraxatisota.rf.gd/abdullah_hil_maruf_video_jalsa.pdf
    • http://xuxamasisovuku.epizy.com/hp_officejet_pro_8600_premium_parts.pdf
    • https://s3.amazonaws.com/mejobu/nsw_health_child_protection_guidelines.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_off0000e6ae.bin
c6cc4ed609b85ef1e7a3bab9d4e8efe7510d278d4d2241cf08a666acae1a8308		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 5540 bytes
font_01_sfnt_off0000f95a.bin
333a18d6c09d08b514ff8b5874d32506b756b4feaccfe76bd0008079110523be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 11004 bytes

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