Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ed800ab9f6da9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 02:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f29da404f27ee110f2f6d34e9f043046 SHA-1: 2f3a4fec62e4cc4cade14d36f2873645f309f3c1 SHA-256: b23ed800ab9f6da93c84fd062f8905802afc347bdcdccae3c2fd654ab57a244c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominently featuring 'bookworm download apk', suggesting a lure for users to download potentially harmful software. The presence of multiple disposable hosting links further indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://garglob.ru/uplcv?utm_term=bookworm+download+apk PDF link annotation
    • http://tuzvedo.hu/elemek/file/fixaborepalur.pdfIn PDF document text
    • http://allycatering.com/userfiles/76549635034.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/vezigirufobunixawomun.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/28768854446.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/wujilem.pdfIn PDF document text
    • https://defi128.com/userfiles/files/jesafewuratevapa.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/9472477999.pdfIn PDF document text
    • https://isosklo.cz/uploads/71120632630.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/likusawojadizera.pdfIn PDF document text
    • https://mkontroll.hu/File/64298557421.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/5436089400.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/368515986.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/segimomumifoteseboduxan.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kotixusesotawun.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/kabizawuvavenibatifatoj.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/31115354711.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210906_818875BFFDA3E3F7.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/zuzukidujosawemiwumevir.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://jacsonsfurniture.com/userfiles/file/33461203096.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/61457472164.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f1bb12fb89d197c7db7ddfb18960cfab/govowezabenazutinodu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0f12447f---48319989504.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/dexebinikupola.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/benozibeviwebefo.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_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 10292 bytes
SHA-256: 3ed987f3d028e8d1c2b5a54fe31984ec9ab44c90f09b1b2157cb688ce7452186
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 18660 bytes
SHA-256: d886b71ee726c8dc4adb5a4f747562a0fa158ec9d8e91958474badd6c2ad61c2
font_02_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1