Malicious PDF — malware analysis report

Static analysis result for SHA-256 0509263bf8cfb233…

MALICIOUS

PDF

75.7 KB Created: 2021-01-23 02:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c63b936401cc2850a54bb7328d278043 SHA-1: 1b026c9cb03d4f19680e07cc3111aee679a3b7df SHA-256: 0509263bf8cfb233467a5061ebf3143567669422b5038e97e25d5e6ba5567da7
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a URL that appears to be a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to screen recording software, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=screen+video+recorder+mod+apk PDF link annotation
    • https://site-1172512.mozfiles.com/files/1172512/38977509617.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/dQjjhik/37167364670.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/iifXhgm/kids_kitchen_set_ikea.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/jhhgI1B/apple_music_on_iphone_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/sPxIdjb/68822381511.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/kTjj1iS/skip_bo_card_game_instructions.pdfIn PDF document text
    • https://site-1178934.mozfiles.com/files/1178934/colorbit_skull_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/Aieijia/football_manager_2019_touch_squad_update.pdfIn PDF document text
    • https://site-1223962.mozfiles.com/files/1223962/famukos.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/cinquain_poem_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/gretjgr/25538006456.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ieihidc/renaxesapogulobofibow.pdfIn PDF document text
    • https://cdn.sqhk.co/baponakazu/5axhi95/dune_der_wustenplanet_2000_trailer.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/jivala/the_green_room_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/coming_soon_page_html_template.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/27680777291.pdfIn PDF document text
    • http://ratadipemor.epizy.com/backshift_in_reported_speech.pdfIn PDF document text
    • http://bovubodomumid.epizy.com/bizovegiruxupinizefixus.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/27947787763.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5236 bytes
SHA-256: 20a06458f6eae6e235b78a21c3cd3f5856e026c166b6f5f157cca706f82fb9b9
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10196 bytes
SHA-256: 706e50c2ca786061afaa515fdf319f25a2f45e41b359aaeca8fdfefa96527ab0

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