Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c138889d080a9e5…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 02:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fcf1fd1aff5eebb811587f0f0f87ee7 SHA-1: af1669179b9897f5706999c9b27e907a3649a163 SHA-256: 4c138889d080a9e5be0d0907668fdb2006122c08ef5c281627482837bc0296fe
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URL `https://vilenefex.ru/strik?utm_term=what+does+loss+of+service+mean` suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI indicate a likely attempt to direct the user to a malicious site, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+does+loss+of+service+mean
    • http://fbcopyright-center.com/which_reconstruction_plan_was_the_most_effective_and_whyxq19k.pdf
    • http://helpcenter.business/how_do_i_program_an_rca_universal_remote_control_to_my_tvp0jrc.pdf
    • https://cdn.sqhk.co/zifalulog/huidXhj/26771426343.pdf
    • http://akillidestekbasvuruformu.online/wefunaa0q7.pdf
    • https://cdn.sqhk.co/rowagana/NhgGjaq/cima_study_guide.pdf
    • https://cdn.sqhk.co/fekerepusa/jhihZhj/2019_usa_road_rage_videos.pdf
    • http://gnoogle.site/muniwukolilefodifotug4bggi.pdf
    • https://static.s123-cdn-static.com/uploads/4478137/normal_5ffda7133d633.pdf
    • https://cdn.sqhk.co/mivoteloxip/jbhhhcD/birdy_the_mighty_decode_episode_11.pdf
    • https://cdn.sqhk.co/remigalakefo/3Kchcp2/mexosakugejebubuwalanosi.pdf
    • https://static.s123-cdn-static.com/uploads/4389603/normal_600635b0d17bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ceb4673-fdb1-4c2b-8e21-909b69751a78/elite_23l_digital_air_fryer_oven_black.pdf
    • https://uploads.strikinglycdn.com/files/e6449107-688c-4917-b572-7c69b246301e/dinixa.pdf
    • https://uploads.strikinglycdn.com/files/199da995-d278-4492-a32b-cb26c95f6f0a/how_can_i_get_rid_of_my_stinky_feet.pdf
    • https://uploads.strikinglycdn.com/files/718e2e7f-d723-48b8-8c87-455024a2609a/become_better_at_synonym.pdf
    • https://uploads.strikinglycdn.com/files/1a6a99ba-9f5c-4814-a20a-6b484dc8059a/kuwoka.pdf
    • https://uploads.strikinglycdn.com/files/78ae3641-bbd8-4c5b-8d8b-8b69a30d764b/example_of_motion_sensory_details.pdf
    • https://uploads.strikinglycdn.com/files/071ce773-eb12-4182-a56d-11aa5f8e3d7b/how_to_find_my_adobe_serial_number_on_my_computer.pdf
    • https://uploads.strikinglycdn.com/files/12bb5c87-67fd-499c-94be-87cb375775ac/juzowexibufati.pdf
    • https://uploads.strikinglycdn.com/files/311eccbe-c4db-4eeb-9ded-69c8278654ad/rezipupokaxupi.pdf
    • https://uploads.strikinglycdn.com/files/b586bc80-3ee3-44d0-9080-3a3ffbe9983d/kenwood_ts-440s_hf_transceiver_ham_radio.pdf
    • https://uploads.strikinglycdn.com/files/847f233f-9d9d-4b45-9163-b73b3c46c66a/frm_level_1_practice_exam.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_off0000f0ab.bin
47d01d87bb2dea136d178107d9041408b9457961b53532875f45939374db2c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5336 bytes
font_01_sfnt_off000102b8.bin
1f996bf5af76da67ff194d57b6a6bdc25f8c34af5391d74785ac822c5e9195cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 10640 bytes

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