Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7a23096dcd6398…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 12:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60b9d265988752a64052f8c70aaf1885 SHA-1: 803bca5f1da9efd1f02f9b21bf595c6f1ecad743 SHA-256: 8b7a23096dcd63985f51fecea019f4939ef521358e7abdf54427686432e19600
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=the+walking+dead+beyond+world+streaming PDF link annotation
    • http://colegiosantarosa.com/uploads/imagem/file/sijisizuluvorobej.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/787cb97d63c1c86848c9c628f2493258/48478764417.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gegag.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/57658678351.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/25903550778.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/zololalilojebodimev.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/94911633975.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9643873522.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/tixudililojevarabugisa.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/20928396960.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140be196d83a---zedovaviwugepes.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907010334400920.pdfIn PDF document text
    • https://wineart.online/userfiles/file/pasevejiz.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/dikitezusifexigefazorab.pdfIn PDF document text
    • http://mfcpavpos.ru/file/57943365242.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/sirita.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/32526829716.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/nugidabezepigikilibejod.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631845521.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/77464850924.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/4993713887.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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18968 bytes
SHA-256: b91101aaca6b557f6b36a360aea6c855c445fc142aebe2fca13f73bc011dfe62
font_02_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 11092 bytes
SHA-256: 1d50b407492bd08c0a91b70eccab8ebbc58b9573d2d518c9fc73b7d746636a65