Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3b6419cab8eef8…

MALICIOUS

PDF

79.8 KB Created: 2021-03-02 05:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0d9116f62b0c65057e91c46cc2ebd4af SHA-1: 7e5ac5259b3513fec234114db229f7e6a7254f3c SHA-256: 7c3b6419cab8eef8bc627c0ce2082a3fae76b9aed3d7a2e72b5599860bcfd000
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing users to execute commands, likely to bypass security measures and download a secondary payload. The document body, though heavily obfuscated, contains a query related to troubleshooting, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=why+is+my+toshiba+external+hard+drive+not+working+on+mac PDF link annotation
    • https://cdn.sqhk.co/nivodoruw/5zMaxJ8/baby_phone_nursery_rhymes_game.pdfIn PDF document text
    • http://gemajesubon.22web.org/silicone_rubber_sheet_manufacturers_in_china.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/romeo_and_juliet_movie_2013_full_movie.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/68944947803.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/7gjjih5/penimanurexotuxani.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/SMwAfe7/54332536627.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/jTEgiIE/bapajefeguwisomimisipijup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fdecb27c4ca3.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/MpjagjC/super_mario_world_flash_unblocked_at_school.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/ghigL14/nozar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitirew/porefetevuterukosapomonod.pdfIn PDF document text
    • http://bojisunizinop.epizy.com/61395382738.pdfIn PDF document text
    • http://nuduguzafasu.rf.gd/biocalculus_calculus_for_the_life_sciences.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/ductility_test_of_bitumen.pdfIn PDF document text
    • http://vejidot.epizy.com/the_game_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/bedipirixinoripusifexi.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/sonic_sega_all_stars_racing_transformed_apk.pdfIn PDF document text
    • http://kusabisaridiza.rf.gd/what_does_red_blinking_light_on_router_mean.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_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 5892 bytes
SHA-256: 5850696d9b6c016fc08d61c5b8a57fd09ba14abfedca7af3e26512a016b592be
font_01_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 10572 bytes
SHA-256: 7b48e78da1cec69d08d5a9320fb645eff24db1fe59c1d1dd977f3a28364c6e6c

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