Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b65f4269df6928…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 16:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0664b2171a7bb9f92760a31ada5fcc6a SHA-1: e4cd594692e87ebd9574caa0d27f333db813cf4f SHA-256: 92b65f4269df692837758f6f3c1d883e78b21a8ecbe8e90e9af32f4c6ec8fdf4
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'midufefew.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'critical care nursing ppt', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/123?utm_term=critical+care+nursing+ppt PDF link annotation
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/fa966e2d21c.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/2bdehie/iphone_photos_to_usb_drive.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/steppenwolf_born_to_be_wild_tab.pdfIn PDF document text
    • http://vovidumuf.22web.org/album_songs_malayalam_status.pdfIn PDF document text
    • http://molatidov.22web.org/wonixexaxojebagi.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/noleteda.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/jugeromijitomo-wetupukotat.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/ii7iahh/rasarita.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/bicidge/54938024630.pdfIn PDF document text
    • http://lamenomapod.iblogger.org/79036675953.pdfIn PDF document text
    • https://cdn.sqhk.co/vixivizal/tSjhHBY/little_alchemist_game.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/kobupixikubesajo.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/iibdlaZ/autoclave_working_principle.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/creature_3d_full_movie_mp4_hd.pdfIn PDF document text
    • http://jakufodunod.getenjoyment.net/the_celluloid_closet_homosexuality_in_the_movies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikexufan.epizy.com/esc_guidelines_for_stemi_2017.pdfIn PDF document text
    • http://fimuwixuxur.rf.gd/gakej.pdfIn PDF document text
    • http://banebogol.epizy.com/11280486399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59812158-3f84-4fae-97d5-a26ffaca6dbc/what_to_bring_for_nys_road_test.pdfIn PDF document text
    • http://wijixetav.epizy.com/pdf_catecismo_de_la_iglesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18aea36-f119-4b33-99ab-860a6ca989aa/vexifeferivejirenuvagiwit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48f57d5-96eb-47fb-938c-d32328b42add/how_to_use_an_arm_blood_pressure_monitor.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/bomgar_admin_guide.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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 5008 bytes
SHA-256: 139295a1cbc7e0ec217c193939fd268b8c0ecb876f94f72a35ccba73250957a7
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 11436 bytes
SHA-256: 09489daaadef83f5d0694895286c53ad8e0a78606a27ebc7d401ee30411654a5

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