Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b24f57a319c70…

MALICIOUS

PDF

83.3 KB Created: 2021-03-17 06:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb96c8b727d198df6f3260992270e1e2 SHA-1: 959ace508cce642f5dcc6f3cad9219f0f96b30d3 SHA-256: 538b24f57a319c70e70d085a6a2e407db3f46f6ef4ccb834575ee267a740d36e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=arya+video+songs++free
    • http://getdouche.xyz/10th_class_maths_textbook_english_medium_downloadnl8nu.pdf
    • http://fifamarketbot.com/company_of_heroes_2_gameplay_multiplayervs4pl.pdf
    • http://wgathering.org/befep445f7.pdf
    • http://trening-ekaterinodar.ru/zibujawufaf6djn.pdf
    • http://banuduxirodeb.mypressonline.com/sql_server_2020_management_studio_tutorial.pdf
    • http://digosutinovun.iblogger.org/53293032400.pdf
    • http://finovadi.iblogger.org/source_sans_pro_ttf_font.pdf
    • http://abwaab.su/nutcracker_hunter_with_dogw5ufw.pdf
    • http://airned.ru/dynamixel_workbench_rosbre6e.pdf
    • http://numoxubur.iblogger.org/what_is_an_infinite_limit_in_calculus.pdf
    • http://kibesamifi.getenjoyment.net/bundled_conductors.pdf
    • http://sandwichhq.club/nezixonapulexag6vqi1.pdf
    • http://midarujiwuvi.mygamesonline.org/does_adhd_affect_behavior.pdf
    • http://egrn-order.online/manual_chevrolet_sonic_ltz_20122n178.pdf
    • http://maduzisuzavi.22web.org/logitech_r800_mac_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://buralusu.rf.gd/arthritis_research_hip_exercises.pdf
    • http://pofiron.rf.gd/ridaguposase.pdf
    • http://gunexukod.epizy.com/prendas_de_vestir_en_frances.pdf
    • http://sisejarozig.epizy.com/i_ready_answers.pdf
    • http://wukezuzuxu.epizy.com/sathi_bengali_movie_jeet.pdf
    • http://lajuvinujako.rf.gd/moped_repair_orange_county.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95e.bin
c866edfb0d26b14021cb9d76716caf0216a33333fb6166fd7b51115833bc8014		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 4900 bytes
font_01_sfnt_off00010a1b.bin
a0ccebce07445f5e3eda404d76ebc384948d3ce1fce5371c12c3072a0acd36e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 11716 bytes
font_02_sfnt_off000131a6.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 4324 bytes

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