Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5146a721421971a…

MALICIOUS

PDF

89.1 KB Created: 2021-03-22 12:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19c28db04c50ec2697b7f48c18c60107 SHA-1: 3b0dfbf17fca4424ba89756ed94621c97fe4d65d SHA-256: f5146a721421971a9128733fe86053e0eb4306270a7d29c7087d85ffdc307841
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed for SEO manipulation. The heuristic firings indicate that the PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links strongly suggests a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=drug+today+book+2019+pdf+free+download
    • https://cdn.sqhk.co/xawobovuji/OjbhPuy/fiwusokewijowuzelewuwumem.pdf
    • https://cdn.sqhk.co/devepogisog/kJjhic4/25236792014.pdf
    • http://kofuwokesa.22web.org/85250774295.pdf
    • http://vonowaz.iblogger.org/good_answers_to_how_are_you.pdf
    • https://cdn.sqhk.co/vizelupavew/yhhhiif/weather_chicago_october_25.pdf
    • https://cdn.sqhk.co/losegiro/IiaAMia/43184404582.pdf
    • http://masozaxo.22web.org/povogunu.pdf
    • http://putoseba.iblogger.org/lizikikivepogujilegalin.pdf
    • https://cdn.sqhk.co/jimevexir/jeviaie/9289443954.pdf
    • https://cdn.sqhk.co/moserusoba/EwhjEGJ/chicken_poulet_powder.pdf
    • https://cdn.sqhk.co/rizavoxaje/Ohigdje/vazanediposomulafomefoxa.pdf
    • https://cdn.sqhk.co/dosijowikul/igEjiie/21100280482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fepusum.onlinewebshop.net/aristoteles_e_dante_descobrem_o_universo.pdf
    • http://xasigidokax.rf.gd/fallout_wasteland_survival_guide.pdf
    • http://puvepedep.epizy.com/avon_skin_so_soft_dry_oil_spray_mosquito_repellent.pdf
    • http://tuvufuxo.epizy.com/dougherty_county_jail_report_march_2019.pdf
    • http://gixopiv.onlinewebshop.net/wonavezatijafowijazujo.pdf
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_da450adfcb1446d38b2023a57f27d3ed.pdf?index=true
    • http://wijegasijewen.rf.gd/substitution_method_integration.pdf
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_e858aa8aebe34a46920d2e2fcfddc2d1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f3c.bin
a4a73e331284dac0a3ae5097d4f818cfb6b0084d54c6c44a5b575431bdbede03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 5908 bytes
font_01_sfnt_off0001338a.bin
c795dbf1334767cdec0ac0931ec70e6b1b1cd86fb44bb155a9262f0c05fe4e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 9748 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.