Malicious PDF — malware analysis report

Static analysis result for SHA-256 3115caaf9f4e3798…

MALICIOUS

PDF

79.5 KB Created: 2021-03-06 10:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: db82edc086c90f0b3128cdf902494b6a SHA-1: 1071055b6e8747541f684565c9303e9965f1bd16 SHA-256: 3115caaf9f4e3798421e8a5e3de61565b6e518a15c7f71ef8f0d0a31d70485a5
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 a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential tracking mechanism for phishing campaigns.

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://leonvi.ru/strik?utm_term=samsung+tv+remote+codes+for+cox PDF link annotation
    • http://vizazovabula.mywebcommunity.org/1234675145.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/49074299180.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/how_do_i_reset_my_idylis_air_purifier.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/tasatoziwivetopesi.pdfIn PDF document text
    • https://sesadawaroni.weebly.com/uploads/1/3/5/2/135295108/luxoluxutufidateke.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/5d2696a72c9f4.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/ijdQmjh/ludo_online_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/igeghiQ/widoxelisamebezujugulu.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_make_a_claw_machine_out_of_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/CGhhrZO/puzzle_dragons_x_season_2.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/mowim_lutasitozunol.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/how_many_calories_are_in_an_everything_bagel_from_dunkin_donuts.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/Giejghi/vopikulega.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/bd3a7174c9cb60.pdfIn PDF document text
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/gawurud_dupasosogetev_xubuju_vorodig.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
    • https://s3.amazonaws.com/vosimalume/guideposts_books_tearoom_mysteries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adc2647-174a-47ca-84d6-cbf1d6174e5d/phb_school_result_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/is_pride_and_prejudice_1995_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/1775662223.pdfIn PDF document text
    • http://vakogez.myartsonline.com/16332817581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c834dcf6-1e07-4e81-8b76-51e7f65796d5/74576646813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a740077-ab35-4db1-b37d-c2552bf9b663/fitbit_charge_4_heart_rate_monitor_review.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/34430242095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a2d839-f6d6-4982-817e-cb24c0bd7c57/himno_nacional_de_honduras_con_letra.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/3ds_max_2014_trial_version_free.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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 5376 bytes
SHA-256: fc41808dc959790b52423b67949e9232259818661454a2d3ad7018ed2b756309
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 10496 bytes
SHA-256: 5cf2f84cda9e12e713fcc8282f031f8d026c23d5a5e1e83b82556be2dd7c983e
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176