Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77283896a3d5177…

MALICIOUS

PDF

83.9 KB Created: 2021-03-22 08:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 52872700d82942a3b5603f47b1a9131a SHA-1: 20e475163683be7bbd56d27a1704cc6a8e618242 SHA-256: c77283896a3d5177f88d39d73c38dd322e224bc5c1f1a4bb1c7808dd2ee549c0
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on potentially untrusted domains. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=carbon+classical+guitar+strings+reviews PDF link annotation
    • https://cdn.sqhk.co/gevajoke/jQU5hbY/contact_football_agents_in_europe.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/xiwuv-tovat-jijibufuwopine.pdfIn PDF document text
    • http://rewita.fun/58596910430u5usg.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/97809.pdfIn PDF document text
    • http://parkji5x.xyz/adding_and_subtracting_fractions_same_denominator_worksheetqx508.pdfIn PDF document text
    • http://limuzinof.ru/is_vinegar_a_weak_electrolyte579kj.pdfIn PDF document text
    • http://free-at.pro/78061183570d1d8h.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/jf3X4Bj/9861304041.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/varotuluso-vefuzomivaz-zogafotuwow.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/PjjcMii/xewasogijanurusoji.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/cNgjgcB/trophysmack_fantasy_football_championship_belt.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/matofumofoniwedusaj.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/what_role_does_school_play_in_socialization.pdfIn PDF document text
    • http://akvatehnika74.ru/arithmetic_and_geometric_sequences_test_answers5ck50.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/wordpress_website_build_cost.pdfIn PDF document text
    • http://beststudent.fun/gekatadedh4x2x.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/7599329.pdfIn PDF document text
    • http://braco.ru/mufedobuxukuporekavupebmio05.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/CJ9gj1M/jugoxez.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/jimivixukaguwipamelemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sipanokule.onlinewebshop.net/timex_1440_sports_watch_battery_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21400284-e67a-41b1-ab11-9928f2b40f1d/domiwabumerataf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f174325e-7f6c-4cfb-95a5-db44b2a9f852/where_can_i_swap_my_sodastream_gas_bottle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19b4a6c-566e-4c30-b7be-c5afc2a613d3/xuzapiwigesaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13516f4-7735-43fa-a973-d9d1f501f4f0/how_to_write_a_critical_analysis_essay_in_nursing.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_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 5164 bytes
SHA-256: 4a6edc6796477c7dea14c53521a0c0e3778ca5c2cd3b3b4c29f2963f082b0bc4
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 11124 bytes
SHA-256: 4cc53693db3a6ac1e084d5ee8b90ab6d2db1be5fb973432711f586dfce3d0433
font_02_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34