Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c5f0df518f9d67…

MALICIOUS

PDF

92.9 KB Created: 2021-04-04 06:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 124c15372acb9b8458c6efbb9f66bcb1 SHA-1: 8656861efbd2e7f03f28069eb40be363c4e3a4c1 SHA-256: f5c5f0df518f9d6710ec763ba3a418f52784392cfa295958c07046724e5539c5
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 exhibits characteristics of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=how+long+should+a+viking+fridge+last
    • http://paruxezogu.mygamesonline.org/rodafex.pdf
    • http://fefosawixamuwow.22web.org/xopiwufegevelijomezunu.pdf
    • https://cdn.sqhk.co/nisosawero/Cjfjbig/tauceti_vulkan_technology_benchmark_requirements.pdf
    • https://fipamexi.weebly.com/uploads/1/3/1/4/131407823/luzag_fekavid.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/migonur.pdf
    • https://nubugudapo.weebly.com/uploads/1/3/2/8/132814946/gakute_jokevawebivan_wedafefo.pdf
    • https://memagakotis.weebly.com/uploads/1/3/4/7/134760483/5880384.pdf
    • http://giboxibefelas.22web.org/janiv.pdf
    • http://zesabekuziwuga.iblogger.org/evaluate_pharma_2019_report.pdf
    • http://vawurabel.mygamesonline.org/how_to_use_braun_clean_and_charge_station.pdf
    • https://radofagomomixa.weebly.com/uploads/1/3/4/1/134132329/3619484.pdf
    • https://cdn.sqhk.co/tewokozogop/gdlrigm/giborosufovanexivasel.pdf
    • http://vawadofofasip.getenjoyment.net/shortcut_keys_in_ms_word_2007_from_a_to_z.pdf
    • https://cdn.sqhk.co/tuzevawu/ggFhggf/meaning_of_expression_heavens_to_murgatroyd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://katogokusow.rf.gd/38631179605.pdf
    • http://napusikut.epizy.com/what_are_some_latin_words_used_in_english.pdf
    • http://resoxivo.epizy.com/36050053506.pdf
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_273eccfef2b4433ca83473055281d157.pdf?index=true
    • http://japinoxizidunub.myartsonline.com/18815379829.pdf
    • http://vagafalim.rf.gd/22031909471.pdf
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_9a7485ec35ef4d8b873a70e32bd841e5.pdf?index=true
    • http://tetuzufolotozop.epizy.com/magical_book_series_analytical_reasoning.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_off00012de9.bin
24601ad2293d21538e4a4041cff65ff4b52a49d8dca8ed83e63a6192e6a05f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 5344 bytes
font_01_sfnt_off00014027.bin
a1a5de13b988d7a0e093e71b8b5a20bfa0b11bd7ee40c4f494009d8105be253d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 11144 bytes

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