Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec74231a32e52b0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 07:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5df2cdc51421f30c53719367a810d1d SHA-1: ece45e87f6efc4d0604bfb948a3b1da1c5eabdca SHA-256: 1ec74231a32e52b05b503146788bcfd0967961bed27feeec1d3be33c2532070c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://infrive.ru/uplcv?utm_term=how+to+extract+obb+file+in+android PDF link annotation
    • http://cornucopiafrederick.com/uploads/files/burafomitorexe.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/72213130626.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45191134---vurores.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bamasawewawuzufejo.pdfIn PDF document text
    • http://synphabase.ch/upload/file/1252664164.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689607df5---56699536019.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/dozaz.pdfIn PDF document text
    • http://minerva-collection.net/files/files/sefopagezovegegoresejuto.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/xugefu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109160736578855.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/74073578452.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kajaxafagixajivodewekuni.pdfIn PDF document text
    • http://rld-carbon.com/file/99476474772.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/70268016824.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/17670858692.pdfIn PDF document text
    • https://somogyplusz.hu/files/8495400543.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/bomafobapum.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/2161775301.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fakenejumijudi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/bosuveworetumuxopoxuroj.pdfIn PDF document text
    • https://mackbeks.com/files/file/5111116489.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69061029496.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/33030141181.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 10620 bytes
SHA-256: 21203518a1d09653ecfcb37b540b136b36cce7ae02b0ac965e299cac65fc8eda
font_01_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 18460 bytes
SHA-256: fa67e682891821ee69df247278293b2957d6f0c9004de2d697195c5a247bd75e