Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bd7c3d6d3385bd…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 16:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 119d88308be5e970fffb3593c83e5d0c SHA-1: 02f304a6bcbb409b4e540845451e46e7be939679 SHA-256: 94bd7c3d6d3385bdbbd443d5595739e03bc3dde119701c21e5683f17507398b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

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://anup.bo/images/files/fovulesasavonevukifufilew.pdf In PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/48702423261.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/bagarodov.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d27141d3e0---12635253533.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/69289914312.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/gebugalodepiwa.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/56352431756.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e60c3970af44e04681158a71f64ddce0/34589822994.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/kobap.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210925062707_y80vf4.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/55322045401.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210925035429.pdfIn PDF document text
    • https://longhoang.vn/upload/files/gowidojibuguzaziwiba.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/260507911.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/vopigotubefabu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/52424483334.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/54632369409.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/58945153274.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109282007238176.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/78378043088.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/nizaruzow.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/tafaxebivitinuj.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/ratag.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/53343785894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=i+keep+having+hiccupsPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 10496 bytes
SHA-256: 87012fa623f8dcf59522fe5cae65fb6a9ce86fcec9914a37c82092ec5aa3f188
font_02_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 14632 bytes
SHA-256: d860ffe86c809cb5ec9dec1cd1caed9afd1c97e0ab69b23febcf21af35268eb2