Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4d6c3a8fa91b18…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 07:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 896a377fe5339b6cb1305e617c585deb SHA-1: adca00fb7331550b449c4d045cae8be088062cc3 SHA-256: fa4d6c3a8fa91b18c79233c92dc4bb0c71f9e9688b5cc567420d8befa8883332
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for redirector links to known malicious infrastructure. It contains a large number of embedded links, many hosted on disposable domains, forming a link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=dell+optiplex+780+power+supply+test+button In PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/9088879.pdfIn PDF document text
    • https://nurowilalivep.weebly.com/uploads/1/3/1/3/131380447/toxumivuta-gaziweselegu.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/1570517.pdfIn PDF document text
    • http://antonioit.fun/imagenes_del_sistema_endocrino_y_sus_partes_para_colorearyti9p.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/3887577.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/fender_fm212r_schematicjx71m.pdfIn PDF document text
    • http://esclick.pro/how_much_does_it_cost_to_become_an_animator7pgto.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/rto_driving_licence_test_book_in_gujarati.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/1219010.pdfIn PDF document text
    • http://groshyk.site/how_to_reply_for_appreciation_mail_from_clientdg428.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/pilesogasumusisebazo.pdfIn PDF document text
    • https://vukibipodut.weebly.com/uploads/1/3/4/6/134690361/difitew_vaguv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejabet.epizy.com/zusubajigaxujuzidetok.pdfIn PDF document text
    • http://juxuvirorut.epizy.com/difference_between_asexual_and_sexual_reproduction.pdfIn PDF document text
    • http://lolunoxij.myartsonline.com/red_hat_ceph_storage.pdfIn PDF document text
    • http://kerexiref.onlinewebshop.net/hackerrank_solutions_java.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/hairspray_script_mti.pdfIn PDF document text
    • http://fegosuzix.epizy.com/msi_b250m_bazooka_ram_compatibility.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_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 5420 bytes
SHA-256: fd7cb6b580a50dcd3dee4df38d2a969ddce2ba1246d22896d71f38678c5f3234
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11152 bytes
SHA-256: 2f90970e47d02c6086e54a6031cfa4d896dc230c9b06ed19f82277280a1c0cb1

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