Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e83dae467f2a2f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 07:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39ca9d4bcf1b2afcc322513c7df0b7f1 SHA-1: 612964bc1025ff8fd7d9402f88c76686eca2e10c SHA-256: b7e83dae467f2a2f5577b85735a667b34f7aa7b798a36c3c7b22cff5f65b5787
186 Risk Score

Malware Insights

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

The document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing sensitive recovery information. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing attempt, likely leading to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://lhdrum.com/User_File/UpFile/file/20210911120304_NTU5MjU1NDA2MjA=.pdf In PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95017163680.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/jedegiwudefaxaka.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/87750458485.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/11480768702.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/54321410149.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/4922580003.pdfIn PDF document text
    • http://szigetkozpalinka.hu/userfiles/file/xusotelarizipupufisile.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/27287502915.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/4326663435.pdfIn PDF document text
    • https://pecsikult.hu/files/file/92776710264.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/65272059969.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/32936148257.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/38544778542.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/20fd65e595f076fd988527b06fd73e1e/7046995555.pdfIn PDF document text
    • http://sooclose.eu/upload/File/23207426170.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bisinup.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/4468435977.pdfIn PDF document text
    • http://mobilenmr.com/files/files/mixugovepinero.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/bubesotazafebuxutirowete.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wutonusalub.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/57886804296.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/41278791076.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/917241049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reset+android+password+using+google+accountPDF 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_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 17388 bytes
SHA-256: 85b374706369639948e3f1211340aa4fe96f018c0ba8fd3a3842bf908839e004
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 10920 bytes
SHA-256: 1b898d9a92461117c00dc890655b8f2712b7613fd5f63fed04d84daafdbdefe8