Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc927ccaf8a5231…

MALICIOUS

PDF

74.8 KB Created: 2021-03-25 07:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025658c7515cab986c72a36c51d74776 SHA-1: 71c809686c488114cc018ddcc08fe8970213fdf4 SHA-256: 5fc927ccaf8a5231f23d2f93be04782526cace1aac3c4c611b0331d8b69357bc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=iron+horse+elementary
    • http://fredo.run/iqsms_reporting_3aq9fn.pdf
    • http://juwupexutaval.mywebcommunity.org/28960902046.pdf
    • http://salet.store/cramped_in_a_sentence3ad5a.pdf
    • http://lamakexo.scienceontheweb.net/38310831560.pdf
    • https://cdn.sqhk.co/waderapal/jbjiXvU/xovexuna.pdf
    • https://cdn.sqhk.co/zekuxemelop/7jc6aQI/buvuvojim.pdf
    • http://tosefabebiribow.scienceontheweb.net/pukivoxigoveku.pdf
    • http://vutunema.mypressonline.com/how_to_remind_yourself_of_your_goals.pdf
    • https://cdn.sqhk.co/lijusute/vLMNhhn/checkers_2_player_cool_math.pdf
    • http://zibepifutidi.sportsontheweb.net/which_is_the_best_echo_to_buy_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1e1f15c-371c-458d-9463-dd8dc7ae8577/how_to_clean_my_hp_printhead.pdf
    • https://uploads.strikinglycdn.com/files/034f729d-ee7e-4536-8d7f-a8ba2f031a5f/diwenibixopazati.pdf
    • https://uploads.strikinglycdn.com/files/defae1de-8d1e-421f-8ac5-9481a845ac62/dometic_rm2193_wiring_diagram.pdf
    • http://nazowovemozugiv.myartsonline.com/best_rear_tine_tiller_for_home_garden.pdf
    • http://naxesabefadufu.atwebpages.com/nekuvojonaju.pdf
    • https://uploads.strikinglycdn.com/files/db9a55c3-68ce-48c4-b2a5-ee07ce14fdec/redneck_manifesto_imdb.pdf
    • http://sofibimibojas.myartsonline.com/indian_government_act_1935.pdf
    • https://uploads.strikinglycdn.com/files/aa8f35e6-fcd4-4341-a6d2-1bdc99e7f1bf/what_qualifications_do_you_need_to_be_an_animator.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_off0000e630.bin
25bb69d8f75f66920fc53ce25610c53d054b17ef5c5cde88068b00b6d46e6dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 4964 bytes
font_01_sfnt_off0000f6e8.bin
e1a2ddd30cae9e9acc61c5b7f6a6484ff5dc3ae19bf0e9300497f1eff578ee95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 11600 bytes

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