Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cb3d4a8dc21e3c…

MALICIOUS

PDF

72.3 KB Created: 2021-01-11 12:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05585cffd36b5bdaec3525fa111f5238 SHA-1: 771204356e694cc7790495e89e6c19d8df84fda4 SHA-256: 35cb3d4a8dc21e3c549fd784898c37ac35a1e0e4a7556ff719cbcaeacef3a564
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. One critical heuristic indicates it links to known malicious redirector infrastructure, specifically citing 'https://cctraff.ru/aws?utm_term=3rd+grade+writing+worksheets'. The file also exhibits characteristics of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=3rd+grade+writing+worksheets
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/ed9112.pdf
    • https://site-1172435.mozfiles.com/files/1172435/bible_story_of_job_worksheets.pdf
    • https://site-1166601.mozfiles.com/files/1166601/head_tennis_sensor_powered_by_zepp.pdf
    • https://site-1171628.mozfiles.com/files/1171628/horse_racing_free_download_games.pdf
    • https://lolewifewo.weebly.com/uploads/1/3/4/7/134710585/lezubujila.pdf
    • https://cdn-cms.f-static.net/uploads/4486041/normal_5fad91b9681d3.pdf
    • https://pemovoxi.weebly.com/uploads/1/3/4/6/134680353/8929443.pdf
    • https://site-1244706.mozfiles.com/files/1244706/crane_gate_valve_data_sheet.pdf
    • https://site-1168170.mozfiles.com/files/1168170/up_move_fitness_tracker.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f971ffe66024.pdf
    • https://site-1180061.mozfiles.com/files/1180061/commander_s_intent_example_air_force.pdf
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fc9e97f56799.pdf
    • https://site-1178466.mozfiles.com/files/1178466/average_football_agent_salary_uk.pdf
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5feba3ec743de.pdf
    • https://site-1166710.mozfiles.com/files/1166710/pozipize.pdf
    • https://site-1172792.mozfiles.com/files/1172792/mobile_soccer_league_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fc.bin
107115bb288d160f292dca85b638fb047fc65b49e8bfead0ac056a3337b5ac32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 5280 bytes
font_01_sfnt_off0000e5f7.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 3720 bytes
font_02_sfnt_off0000f15a.bin
a30a06aa69b7643ccf7c2a1bde3191114fb60a9f81002ed25d0bde25ef3d939e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 10136 bytes

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