Malicious PDF — malware analysis report

Static analysis result for SHA-256 392b0c0289c6b56d…

MALICIOUS

PDF

98.0 KB Created: 2021-03-04 04:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c7644ea6ad937c3ba8171d99c5409b4 SHA-1: af3c72181d2270da31881d17e2a9030ce0d43ca8 SHA-256: 392b0c0289c6b56d3525d29a9592c05e147050d4d34415ab47c531aee7107509
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious or phishing sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or credential harvesting attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=palm+oil+fuel+ash+as+filler In PDF document text
    • https://cdn.sqhk.co/dasotipamu/icghAjj/small_business_loan_source_llc_houston_tx.pdfIn PDF document text
    • http://dhl-order.info/lart_de_la_guerre_sun_tzu_film8hlum.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/xD4jghe/five_nights_at_freddy_s_3_unblocked_download.pdfIn PDF document text
    • http://cosmicgig.com/rowajunilawonafilnct91.pdfIn PDF document text
    • http://iblack.space/rurititimafur95pcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_60152f0252c8f.pdfIn PDF document text
    • http://wersita.space/dusagesuboqeniv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383132/normal_6004d7109e27a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_600aa26164e7a.pdfIn PDF document text
    • http://robot3.site/futewomepotopaduginofik6k36.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/formato_de_resguardo_de_equipo_wordnsaha.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/kumijajejubobixi2ay7y.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/jbgjsia/tip_top_poultry_inc_zoominfo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuposusan.epizy.com/handwriting_worksheets_3rd_grade.pdfIn PDF document text
    • http://funijapubuf.rf.gd/viputewa.pdfIn PDF document text
    • http://bamasagure.epizy.com/ultimate_book_of_accountancy_class_12.pdfIn PDF document text
    • http://vanabigura.rf.gd/chiari_malformation_type_i_cmi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014e82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E82 25448 bytes
SHA-256: 0824a2b8e6883c39ed308d31390e3a4a9310933ecfb46fad50fc8a5d09f73c1c
font_00_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 5008 bytes
SHA-256: cb5925d7e4418b0d1623c11c0112ed2d3e2ad060b686f6b3d695ef804aa26cfb
font_01_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 10996 bytes
SHA-256: e70c3052839e663ffad0d1635b483120e47a74ff3c088671f687c8f559b98604

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