Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa487074e884c4b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-11 19:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 62affdc09adb2c4308d6b4c81886fe82 SHA-1: 0bf11f630ff94a45cd315b2454fdd258c5bcb0ac SHA-256: caa487074e884c4b2f54e2e455cf32a01772d76c06a0f87e9d2e3d6840e0f1fe
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, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'organelles function pdf', which appear to be lures.

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://bologen.ru/award?keyword=organelles+function+pdf PDF link annotation
    • http://beliyden.xyz/snell_head_and_neck_anatomyaknb2.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/depojida_rirebokig_noxifina.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/sLicgdA/green_poop_mean_pregnant.pdfIn PDF document text
    • http://yourbigdick.space/lofujisutema0x87w.pdfIn PDF document text
    • http://rakojegad.22web.org/19445381603.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/8609965.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/renajeba_najugonajon_wegare_jadujude.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/9078165.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/94790405609.pdfIn PDF document text
    • https://didaripetog.weebly.com/uploads/1/3/4/6/134685212/zidasalotibede-rijevekejirisel-xovixolamatevak.pdfIn PDF document text
    • http://hackins.site/best_online_photoshop_course_free3t7t9.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/iigd5gc/fonts_for_instagram_stories_copy_and_paste.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/d583e.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/SibXR4Z/retarowawafedazalepetego.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/kabujenekat.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://lapetagalelan.myartsonline.com/36588277002.pdfIn PDF document text
    • http://jarunitilor.rf.gd/buraka_som_sistema_hangover.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/zituratewetumoped.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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 5232 bytes
SHA-256: 8c4fc616b6abba4a300ed06fe4467fe2ebe728048199ccffa8db015458c75d25
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10300 bytes
SHA-256: 20e6d98367379a6f5930c9a3eaeea13d4ab0c9777848d637195e0d397f682f39
font_02_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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