Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f719ac95be08c9…

MALICIOUS

PDF

73.9 KB Created: 2021-04-06 07:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6315cca0abfc9063281a33c0589d31d7 SHA-1: 22a7d95271ae68247b895ef6882a6c54547f6f25 SHA-256: d8f719ac95be08c9399c75148f31a09de4032a1dfe296cfe81f74026a32a5f6f
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the embedded URLs, 'https://soxebez.ru/123?utm_term=chessbase+reader+2017+free', suggests a lure related to software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware through the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=chessbase+reader+2017+free
    • https://cdn-cms.f-static.net/uploads/4388282/normal_6048c6ed3b871.pdf
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/fijalewutewivis.pdf
    • https://cdn-cms.f-static.net/uploads/4451355/normal_6025302a46c33.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6050f397959c2.pdf
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/domonuwomup.pdf
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/6023825.pdf
    • https://kavivapepegag.weebly.com/uploads/1/3/4/2/134235540/af754.pdf
    • https://cdn-cms.f-static.net/uploads/4401517/normal_6041c18d5a96a.pdf
    • http://yewes.fun/44400733933uolo0.pdf
    • http://luxshop21.site/85540280981oymge.pdf
    • https://static.s123-cdn-static.com/uploads/4376359/normal_5fffff5059b35.pdf
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5ffb218f8867d.pdf
    • http://tejovotemikodes.getenjoyment.net/gce_a_level_physics_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4412161/normal_603a4d0c94b96.pdf
    • http://manamuposa.getenjoyment.net/befudixuj.pdf
    • https://cdn-cms.f-static.net/uploads/4418367/normal_60461feae6a27.pdf
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/lewibovazifiwodexil.pdf
    • http://creditreportus.info/zojefevujolesasitizidos3jfp.pdf
    • http://buxeletifexid.medianewsonline.com/autocad_lisp_commands_list.pdf
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/99c84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://powagamojij.onlinewebshop.net/pulmonary_and_systemic_circulation.pdf
    • http://zatuvejamubolo.atwebpages.com/pradhan_mantri_awas_yojana_application_form_in_telugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f5.bin
386a171bce1c171bc4da710b7ad1abbc82cc0c117eb24e9d904681605b846d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 5416 bytes
font_01_sfnt_off0000f358.bin
1416255cb965c71fac9a0d3cc040b35893bf925ee641b51e06057a7eef4ce0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 11328 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.