Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c6f06206d696bf…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52d76c2199dadf67502b72c0aa9b34e2 SHA-1: 382a3d2fb7d0ed549b2ec163526d03bce89f3be3 SHA-256: 11c6f06206d696bfb779591fb3a7e1f70ccf2d5c00c6fd87862d0101b59f26ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=rtsp+viewer+android PDF link annotation
    • http://radio-salsa.com/php/rs/filesupload/file/dajakaxukukopepexib.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/jawegabanudaz.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/begezumivazej.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/11979272449.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18731433326.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff5525ab---74309545699.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/29776267314.pdfIn PDF document text
    • https://wittnebel.dk/file/dedezatunig.pdfIn PDF document text
    • http://toroisg.com/public/images/files/76119082731.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/5205315744.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/zevegegosiz.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/43747610546.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/58006642085.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/fujokumadajifapozozenives.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/nanumukosujatirefo.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/21567138489.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/xiwifovag.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc78b5ae7---xegujux.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/21740697104.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadixobex.pdfIn PDF document text
    • http://allycatering.com/userfiles/56656198017.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/71229299529.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/jupakozevegivitiwam.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/82630081154.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/kalonibuxirepivobuvigez.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_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 18292 bytes
SHA-256: 7ebb0c02c941af760d2c07ec98e2b192ea5c21f44e4befa8a507fd1215e8f69f
font_01_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 10536 bytes
SHA-256: 064025e702021a5f954ef958a47e2e37fba142fe8ecaa7237417277df7dfca63
font_02_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1