Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abf5aaf92508c5f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 08:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 613ea2854d0c0db48b4275ed01fabc02 SHA-1: 88e2612193e64a1259ec3741fd3380ea95ccf250 SHA-256: 5abf5aaf92508c5f4d9dc207ba4bae7544dae32c692faf0467985d654121f43b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics suggest the PDF is intended to lead users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=criminal+case+save+the+world+apk+mod PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/dokesubad.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/17690092209.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/25950547137.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/gedapubaresu.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/fozujodeb.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/10254586475.pdfIn PDF document text
    • https://polandpools.com/contents/files/bunolimorir.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tidopopuruf.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nepaxefijufebuvi.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/tovogofelanuxewotufek.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sifajofigimizeberem.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/96754157163.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/zazitadumuwumag.pdfIn PDF document text
    • http://akademibt.com/resimler/files/deworodusabemewogudowa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7358df3e---49468963429.pdfIn PDF document text
    • http://beiks.info/public/file/nadosikififovasewi.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/21203438059.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/zukuzilofenixexozaw.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vujuzefasob.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/92288853725.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/61661664049.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210918_E270A82C986E3FF4.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 11056 bytes
SHA-256: a56bbeac7766ecf99bd5b17c768724629a4d0e4ed8d8c6ee9cc2a5c491af89fe
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 18312 bytes
SHA-256: 6457f051966dc694af000b51fdf63035d1f63ac6945fa867487bf782de69877d