Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e76135909fae80c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 04:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21c22531aa90b952f25637d8538c183b SHA-1: ee8a43e8467d7d496a332ce6aef9aa29ecacd6a2 SHA-256: 3e76135909fae80cb8ed8908136a4c726c7f15dbbb07e3b7242e13e858fd36b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to external PDF files. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest the PDF's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://1000projects.ru/upload_picture/file/fosutinodizasumizute.pdf In PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/84121325135.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/84795319264.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/593705336614af34c95103.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kulaxivinon.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/bubefovidagemufusobafigi.pdfIn PDF document text
    • http://logicamail.it/draft/media/vezolowapuxos.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/58939410628.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/3501004115.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/59798370673.pdfIn PDF document text
    • https://wlweb.co/sites/default/userfiles/file/2524792069.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fuwixubilin.pdfIn PDF document text
    • http://hoachattn.com/image/files/xezufipunuvilavogonokex.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/6g4mm45fhlhnmgaecgj7datt40/tivulaxisikapupidulupelaw.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906073002.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/26064533890.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vufoloduxogo.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/36748231010.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/fabusarajeje.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/wijewonatofatoxifarek.pdfIn PDF document text
    • http://email-database.info/userfiles/file/28390555580.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909051912368929.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosagifuzatitadeludizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nsfw+rpg+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/tiff/1.0/In PDF document text
    • http://ns.adobe.com/exif/1.0/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/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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 14544 bytes
SHA-256: 25bf970dfd58a6565ca8ba5bf2ceb0f29dd7c9bdee258b0a2d8145eb3bcb78ae
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10460 bytes
SHA-256: f4919f08554a5dea5efe1c15efd279d87901d7fc41fb09bfbcf82f6f66079895
font_02_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1