Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a34e35904253cb1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 10:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 796eed437e6a5671b44a99885cc3f274 SHA-1: 1466b6b89d20d8875f63c2479f30ada092302c1e SHA-256: 8a34e35904253cb1af941fbd4ff0370e2da1aed6a9151db2f519c560aed224c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=joe+fortune+%2412+code PDF link annotation
    • http://nguyenthaotech.com/upload/files/fanelitedoxobovo.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/2924771453.pdfIn PDF document text
    • https://artenika.pl/fck/file/7542655754.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40010703415.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/pedezides.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/218821893730307a7dc4709d51df7042/wosajine.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/sipatibefejuxeweke.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/rafunum.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630838952.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/wamoziriwubijoxegizesopa.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/18125240027.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/76493579104.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/rekojewubidisogukur.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/76518635444.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vimovanutefivazeda.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161310211348f1---luzodepugikisufolenuniwa.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/37853810851.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/86669703340.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/50462226098.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/ruwosekajo.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/zafut.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/lilobifazinumofewuto.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/lifodedol.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/26789741892.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jotogizagimamojijotivi.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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 17344 bytes
SHA-256: b67db21b4b28877cafc468aae97f02d538901d0f37818ed8a44c414b33509d23
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 10472 bytes
SHA-256: c13036799b7a72462c1661762012fbb28fb3f9b096963f6936f507a59dd55803