Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8821cdb5543f0b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 09:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9803de63748467024086ee6e497de364 SHA-1: 4052d61fe46f7149ed99e9ba51f7b059be8217e1 SHA-256: 2a8821cdb5543f0bd53bfa57a76c01b50719a2171737f56f1afbb5f2c367e9eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=the+good+doctor+season+4+123movies PDF link annotation
    • http://prvugkh.ru/uploads/files/32136839610.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/makiboroxujeminofov.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/20805151573.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vikipulisumofurovi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/53401356168.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/dojitawenuraligukumuxame.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/67400171794.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/89885324878.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/97486263256.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sewogeninu.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/14666038631.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xexikenatazilexofaxaje.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/55854970660.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tokafutasetexe.pdfIn PDF document text
    • https://majubesar.net/contents/files/65578254616.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/mizatidobobupar.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/xekimilegegepilim.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tegigubaguvo.pdfIn PDF document text
    • https://tigaintan.com/contents/files/vegubetizi.pdfIn PDF document text
    • http://goldmustang.ru/files/files/35248835899.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zumurekuvekafopivuz.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/78280562504.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a943d2c4---67885216453.pdfIn PDF document text
    • https://braus.uz/images/shared/file/suronupapemisanusa.pdfIn PDF document text
    • https://123natura.com/stockages/files/97423181818.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/25649191503.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_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 11220 bytes
SHA-256: 5821ec0ea840a3a0abe3980a78b2388769c2799b22ef1bcfb567588004d41d4c
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 17208 bytes
SHA-256: ba8980cbe5a875256dd59468b70840591c63445cc80c7b06f7e8f0e267b1e4ed
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1