Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae037638238adfa9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 16:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4474c81b4d0661a11002fd27e02ec474 SHA-1: 34f412297ad55ed00796d84c451a53ec5adfab87 SHA-256: ae037638238adfa98a08b65a9a80ea6cb89155f65ed02f7eff2a4fd3420524a7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to product pricing, suggesting a lure for potential victims. The presence of multiple disposable domains and link farms indicates a coordinated effort to distribute malicious content.

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
  • 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=how+expensive+are+hunter+douglas+shades In PDF document text
    • https://cdn.sqhk.co/banijuwa/idichhg/top_cigarette_rolling_machine_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/jiddugi/xasupetegijogomufo.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/j6Oeggn/fernanfloo_saw_game_solucion_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/gAiagdK/65555637547.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/EQiiHhj/11615041892.pdfIn PDF document text
    • http://wugilunage.iblogger.org/kenwood_ddx470_bluetooth_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/8JJpHhb/71454877571.pdfIn PDF document text
    • http://soldonlakewood.com/balerato_masione_songplx7f.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/pwrNUid/99714931088.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/icjijfW/apa_itu_smart_in_pays.pdfIn PDF document text
    • https://cdn.sqhk.co/fufeboxeri/phhaU2P/12569851150.pdfIn PDF document text
    • http://rameautbxy.space/therapeutic_foster_care_aztgrmd.pdfIn PDF document text
    • http://antileqphh.site/shashi_tharoor_book_inglorious_empire_downloadxpz4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalufebali.rf.gd/17862603261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2e1e76-be74-4cb2-919b-f6ff18f1ff5d/80388769102.pdfIn PDF document text
    • http://tejebakaropa.epizy.com/63132316694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abe7dd2-8660-4c92-bc05-53f02e429440/jersey_mikes_giant_meatball_sub_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9716705-81db-475a-b676-ab1119838c4a/wezukif.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5400 bytes
SHA-256: 60af6d66ef6d694add7b562c0058d3fd5028ca45b94a71f0675414f8a8f9f094
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 11356 bytes
SHA-256: 7e8fada34970f781b554015d19a65907764228b8068b7cc886c838126d5154ae

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