Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daa80cd8c8a0c1d…

MALICIOUS

PDF

78.0 KB Created: 2021-10-04 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43d78c2c3fc493d523f58adb8d0146ce SHA-1: 003d9084e2094cf8482f23cfab9a83d6b953978c SHA-256: 3daa80cd8c8a0c1d0250f2568b3ffbc452535ff347fa5a2c997b35328f5ab2aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=categorical+data+analysis+3rd+edition+pdf PDF link annotation
    • http://bestbelly.org/content/files/files/29827882498.pdfIn PDF document text
    • http://esejsc.com/upload/files/toribotat.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/piluvalatopaxikipewuvumi.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/linawududafukomaxitak.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/52026386482.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/nuxol.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/61809534936.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/25060762811.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/70908193866.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/97652316352.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/misijefajawuludozudolud.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/83783362775.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/nekafen.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88d9b4f19---79698597874.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/66478201471.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/42750020059.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/boviribaxujukab.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/81712061316.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/gafama.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/65400031024.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/26512808623.pdfIn PDF document text
    • https://stormester.no/files/file/89107546980.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/68291049680.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.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_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 17952 bytes
SHA-256: 339379697f09fb67a77604b5a721fa42d198feea0a4d91af844b2294240fe1ba
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 11112 bytes
SHA-256: 97b387001b9222be424a15069e7258303d822ad0ab0ed1b93ee785a763914194
font_02_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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