Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90da47488f3a224…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 19:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48de99d991b4355228576606deda9208 SHA-1: eff5e838f0525105b250eed0406f499d3fcfdf62 SHA-256: c90da47488f3a224af634d7c56f3feb76efcc5977b9c509180ece259fc004dba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and the nature of the URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://tribo.kz/userfiles/File/wadid.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355154304bb---61277083686.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/dugafep.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/polodawomivetoduzesumadun.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/40484546418.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/66074308571.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/dovusuvukofawotupiledagi.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/ripumonuxamidifanep.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://tbsva.org/Upload/files/20210904191806.pdfIn PDF document text
    • http://njchemland.com/upload/files/51911043400.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219211538192662.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wajidezodukukazizejavari.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/fojemetewebizubo.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/30690610830.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/dumari.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143af51ddd80---damonidenesil.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wuvosulok.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/36033952788.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96314777968.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/10038419626.pdfIn PDF document text
    • https://ka-base.no/images_students/files/fonidumo.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/pemiteruwixajaxazidak.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/13908482169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=latest+games+apkPDF link annotation
    • 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_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 10180 bytes
SHA-256: 366eb0d58e14e679e386255ab70b239e8fbff803731fffdffb3ab65d7c75d65e
font_02_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 18280 bytes
SHA-256: 5e6d02fec1c87eacc9b2256a39ae0b9edd524068d507070ed3b0d544743b93f4