Malicious PDF — malware analysis report

Static analysis result for SHA-256 53104fd210e51762…

MALICIOUS

PDF

80.6 KB Created: 2021-04-11 12:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3a9a12a8526360f16f3bd4a96745d7c5 SHA-1: e30ba403f7ac0625311baa02bc0f211aadd4d89d SHA-256: 53104fd210e517624cb970f5170be96fb3c9be8e09ec3b372292ae366be6e625
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to potentially malicious or link-farm sites. The document body, though heavily obfuscated, appears to be a lure related to 'how to use wahl trimmer to cut hair', which is likely a pretext to drive users to these external links. The presence of many distinct hosts and disposable hosting indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+use+wahl+trimmer+to+cut+hair PDF link annotation
    • http://sportplays.ru/roditabenes3su45.pdfIn PDF document text
    • http://jumbochecker.com/37972983641ds4vt.pdfIn PDF document text
    • http://tradestaroffice.com/redapejoxikk5vg.pdfIn PDF document text
    • http://autoport76.online/mijozegomakotifafuputujiujb7a.pdfIn PDF document text
    • http://presente-top.store/gloomhaven_diviner_ability_card_linesel783.pdfIn PDF document text
    • http://intereriia.com/drinkwell_pet_fountain_cleaning_kity159c.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/walubediborutabomakonupa.pdfIn PDF document text
    • http://kompledom.com/8756722561fxc9n.pdfIn PDF document text
    • http://oyuncuxx.com/punctuation_worksheets_high_schoolx3opd.pdfIn PDF document text
    • http://lozepamubi.iblogger.org/42801610628.pdfIn PDF document text
    • http://wow50.pro/aia_full_form_in_bsfhv677.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
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_7c8abed17e8c4a3cb13d9704518d4ea5.pdf?index=trueIn PDF document text
    • http://makakanow.onlinewebshop.net/acidosis_tubular_renal_clasificacion.pdfIn PDF document text
    • http://mujunuge.rf.gd/projeto_captao_de_recursos.pdfIn PDF document text
    • http://todizegi.epizy.com/magnito_adebayo_free.pdfIn PDF document text
    • http://biviroromu.rf.gd/brother_dcp-7065dn_printer_software.pdfIn PDF document text
    • http://wupidusujimi.myartsonline.com/concierto_de_aranjuez_trumpet.pdfIn PDF document text
    • http://jomupaz.myartsonline.com/26923265431.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/66747714875.pdfIn PDF document text
    • http://tegemikewik.rf.gd/pottery_barn_asher_airplane_crib_sheet.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_c3b62654463844e595b99135ecb835d5.pdf?index=trueIn 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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 4868 bytes
SHA-256: 6d2381b379672a6fedca43dbaa4ef673358bd3735723a143172e0510b2727164
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 11936 bytes
SHA-256: ce570d6a38e10cc8a0628e6bd8ab13c87f48a7d5ac9075280bbfdedbadc432b6
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378