Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e08c2162be97df…

MALICIOUS

PDF

88.8 KB Created: 2021-03-24 16:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f549d2ff785da0a2b4f4b48b6bd2a15 SHA-1: 9d9ff854f1783a6bab5653a45324ba1dae098de4 SHA-256: 41e08c2162be97df23e89004abb57099d5e975be8daa2b931292682333b3bca6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/strik?utm_term=glencoe+biology+answer+key PDF link annotation
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/7867076.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/Rfhc7gj/nerododokimid.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/jesomegi.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/fowapapitebugeg-kisone.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/raquitismo_e_osteomalacia.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/6d8e24a.pdfIn PDF document text
    • https://robiduvasolowa.weebly.com/uploads/1/3/4/6/134657162/bosesusavapu_dojitefopaj.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/12377748442.pdfIn PDF document text
    • https://mepuviduvudutew.weebly.com/uploads/1/3/4/3/134383325/6885999.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/jjOK9if/kideme.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/motorboating_merit_badge.pdfIn PDF document text
    • https://gaviwejijeto.weebly.com/uploads/1/3/3/9/133997776/55d80a5e9d.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/pesadixiful.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/cighhfN/texas_longhorns_basketball_recruiting_2021.pdfIn PDF document text
    • http://jogemutujup.22web.org/bourne_ultimatum_script.pdfIn PDF document text
    • https://noripuluse.weebly.com/uploads/1/3/5/9/135957130/jamigole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://jixojamut.epizy.com/11199143192.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/97122757146.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/beedi_scholarship_application_form_2018-_19.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/81694761010.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/foundations_of_web_design.pdfIn PDF document text
    • http://lovifepomuxi.rf.gd/industrial_psychology_filetype.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/institute_management_system_project_report.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 5396 bytes
SHA-256: 158a4d3e574a79a80a7948420da1541f30219e9d2a3dd68302cb01705f7d19fe
font_01_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 6640 bytes
SHA-256: eca62b72654736461a635ba366d09d794777fd95c58152d2b251becdfce657e0
font_02_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 11036 bytes
SHA-256: d321290952d6c2fbff645c668513d80f259bf0e84bde730a2d8d60f7341cef54