Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07c05e9bc9eb100…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 08:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc370adbe046965d39167324a7675d34 SHA-1: 7f20710ef866459232c080a7fcd5e58759cbe971 SHA-256: d07c05e9bc9eb1007b4c56db4803832e755f8a8505cb24e8a178c77a68669b51
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. The presence of numerous external URLs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614add77395a3---vatojodimufofimubajo.pdf In PDF document text
    • http://artc-polymers.com/upload/images/files/fividij.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/dogijilijopexep.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/ridav.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/45365814059.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/42144461046.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/7875184941.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/65056442740.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/55923874931.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd0de30dc---gawufavuxidalutu.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vazewujepoxo.pdfIn PDF document text
    • https://web-dev.ethioapp.com/websites/lightyearsahead/code/userfiles/files/85283313596.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/69818707185.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/83644071861.pdfIn PDF document text
    • https://palet-school.com/files/files/fenuno.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/diwurusumukemapepo.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/34472261327.pdfIn PDF document text
    • http://modero.vn/upload/files/90756238907.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pavewax.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/89761210847.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/misegu.pdfIn PDF document text
    • http://ergakiland.ru/files/files/dileziwogopasep.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/42377981722.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/rumuda.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/pitumotiwugapuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=xrecorder+download+appPDF 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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 10240 bytes
SHA-256: 3903f7dac543ed0f31c32a868e6c2b446bc2e1c2563943b7e6930ac16c7d9011
font_01_sfnt_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 15032 bytes
SHA-256: 8791404b13e2c1b2ccb4fcbbea98a590d6409eb8c0971405301b1e18045e59b3
font_02_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1