Malicious PDF — malware analysis report

Static analysis result for SHA-256 1825dcb9b53d3352…

MALICIOUS

PDF

84.7 KB Created: 2021-02-20 18:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5beb5cc34a970045d9c1df85fda1f20f SHA-1: c0b840f11a4c69fc793f782ef3465bd695f762cc SHA-256: 1825dcb9b53d335268d7cb31d4712724eea1f506374696ff817acd141eb99e01
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a lure related to a game review, directing users to numerous external URLs hosted on disposable domains. The presence of many links and the ML classifier output strongly suggest a phishing or malware distribution attempt.

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://baarspo.ru/wb?keyword=call%20of%20cthulhu%20rpg%20starter%20set%20review PDF link annotation
    • https://cdn.sqhk.co/julukijowi/geXjdhh/csgo_skin_color_name.pdfIn PDF document text
    • http://gebajajax.22web.org/website_screenshot_chrome.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/vitaxazapoge.pdfIn PDF document text
    • http://pogetukexuk.66ghz.com/92009132529.pdfIn PDF document text
    • http://buboxekavugi.iblogger.org/budget_binder_templates_free.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/fur_elise_music_sheet_for_piano_easy.pdfIn PDF document text
    • http://monogawuw.iblogger.org/3553517194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sovewegupafipiw.rf.gd/84156092787.pdfIn PDF document text
    • http://fezekugagow.rf.gd/90328248814.pdfIn PDF document text
    • http://waxaravibew.epizy.com/bratstvo_crnog_bodeza_15.pdfIn PDF document text
    • http://fubegamo.epizy.com/dubuvitunijopejetagusili.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/functions_of_blood_cells_worksheet.pdfIn PDF document text
    • http://dukijugijelaga.epizy.com/video_cutter_program.pdfIn PDF document text
    • http://xedovafimolodem.epizy.com/anybody_can_dance_2_all_song.pdfIn PDF document text
    • http://lufadavebu.epizy.com/gul_ahmed_bed_sheets_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5228 bytes
SHA-256: 49fb04d879508f9c9a5ff429bc344b9c89ab5d02b15a7b54ac50f917fcb71255
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 11196 bytes
SHA-256: 32298ede70eebbfdecc375b78908523db09aa8b5655867a7f38fd4f94c2050b8
font_02_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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