Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8e24e79807555a…

MALICIOUS

PDF

87.5 KB Created: 2021-04-30 20:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9bc66cb8b6b360cf5c8610c4af91b28c SHA-1: 6a168ae5c5baceb85fa6b12e946ea44d30b00a83 SHA-256: 7c8e24e79807555a66e390d1d12f84c3ff5c65f3e58f768eb9c0cb592f769f81
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 numerous embedded URLs, with one prominent URL, 'https://maypoin.ru/strik?utm_term=my+nail+gun+stopped+working', identified as a potential phishing or malware distribution point. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=my+nail+gun+stopped+working PDF link annotation
    • http://gelchlen.fun/new_holland_sickle_bar_mower_parts_diagramwf74k.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/olevia_tv_universal_remote_codes79lep.pdfIn PDF document text
    • http://accface.in/sharp_objects_ending_bookr2uuf.pdfIn PDF document text
    • http://eurozone.pro/how_to_find_initial_velocity_in_projectile_motion_equations9jsgi.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/2471161226.pdfIn PDF document text
    • http://fherixq.com/fuzalizoxigitawokam2ycf.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/naming_functional_groups_practice.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/xupovobejanam/character_sheet_d_d_beyond_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e956cfb9-a616-4c1e-9b13-deecf7efabdc/96364914492.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/best_ps2_emulator_for_android_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d6d500-3818-45c0-b74e-70e7d6544c9d/54647385489.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/xuxobafesijakubanebavenur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7814b8-0d23-45e8-8936-eaa54c66168e/how_do_i_start_learning_php.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd971e8b-ba89-4726-8edd-e8ea019b09ee/radioactive_decay_practice_problems_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/busted_year_3000_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2c9f3f-0107-45e3-8336-85227b5f32d1/nick_saban_process_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef96bdd3-7e11-4318-bac0-c290ddead548/what_color_is_cat_5_cable.pdfIn PDF document text
    • http://gulagopafed.onlinewebshop.net/51523180766.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/verizon_quantum_gateway_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7331a9c-d868-4c19-8a52-27f861f69b4b/5756744067.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/19248541973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb904c38-3e3b-4636-a33d-a452934ac801/73186298912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3557de0-4b53-4f5c-bf40-4b33b910f670/69456116117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bcba40-20be-43f5-a051-2f96c66e36e9/club_car_golf_cart_battery_charger_troubleshooting.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_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 5392 bytes
SHA-256: 73d7086c937b499b4d0289777c07377c38de97c8280fecc994f173ec30071435
font_01_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 13308 bytes
SHA-256: 1f44cd475b031ad5f2aa2baf0d6eb3368a3a3f078fa1d5a647127e7265f6d751