Malicious PDF — malware analysis report

Static analysis result for SHA-256 9277c907d3ac7a9e…

MALICIOUS

PDF

76.4 KB Created: 2021-03-13 15:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9b203a4250610b8974ce22391b8a37cb SHA-1: 1855d4365cf3783557b3cffd9169fd439e7aac49 SHA-256: 9277c907d3ac7a9ed03135461f357f1a86192c33c14a8fa4f14ff34a61e18514
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked content. The presence of a redirector link further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/award?keyword=accounting+rules+pdf+file In PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/torasabira.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/7162223.pdfIn PDF document text
    • http://ladifupa.22web.org/wosepowagaresetag.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/3280153e91a.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/veziso-funebuti-dowukawedak-fegelixanosu.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/nataludonovitu-vukivokun.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/lasejedoxibub.pdfIn PDF document text
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/sagimij.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/email_architecture_in_computer_networks.pdfIn PDF document text
    • http://vemasujananexu.22web.org/tifuzubi.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/mawaj_voxokajate_wuvelijivuk.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/32305263458.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povovudajax.rf.gd/gusopeneti.pdfIn PDF document text
    • http://tibogav.rf.gd/does_sonic_serve_fried_oreos.pdfIn PDF document text
    • http://nekepozime.epizy.com/video_converter_pro_key_4._0_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/bowflex_xtl_power_pro_manual.pdfIn PDF document text
    • http://jasesazolaf.myartsonline.com/kinds_of_adjectives_worksheets_for_grade_4.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/18276739129.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/lenaroxuxogazafo.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/loporotirowafa.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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5104 bytes
SHA-256: f5d7b27d7cadf3c19b90e4b01f7e9e733a29f1cf4535d8ed87d0db13ae8a8e11
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 11240 bytes
SHA-256: d5a23051281b3a5c52cd2b9c30bcc055311941a269a741be258f1a3ec099436a

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