Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b939c85bc7f032…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 04:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d97f960650dbca96f7acd7ce8787b9c5 SHA-1: 3adf7fb7e96c9dd2a9bb2c91eef33a6ee8f6f999 SHA-256: 53b939c85bc7f03286b3fd0a2ad480ba9611478197d767e28a6e92a9375bd63e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://bologen.ru/wix?keyword=the+lost+mariner+case+study', which is likely the destination for the phishing attempt. The document body, though heavily obfuscated, suggests a 'case study' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://bologen.ru/wix?keyword=the+lost+mariner+case+study
    • https://cdn-cms.f-static.net/uploads/4447437/normal_601e6edb6a0b8.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_60673acf5ce38.pdf
    • https://cdn-cms.f-static.net/uploads/4404296/normal_605aa5401c5a1.pdf
    • http://runolive.com/jujapomuzamabudicqkau.pdf
    • https://cdn-cms.f-static.net/uploads/4474471/normal_60370808ceb0b.pdf
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6013c4bee8eee.pdf
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5ffc11a573d94.pdf
    • http://lnstagramcopyrighthelps.com/clinical_data_management_salary_in_indiaayjt7.pdf
    • https://cdn-cms.f-static.net/uploads/4380530/normal_6035336bd801a.pdf
    • https://cdn-cms.f-static.net/uploads/4480142/normal_605f6ad13df12.pdf
    • https://static.s123-cdn-static.com/uploads/4481069/normal_600919ef1ac91.pdf
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5fcb7b5ab2d07.pdf
    • https://cdn-cms.f-static.net/uploads/4458404/normal_603362666585a.pdf
    • http://liko-sneakers.com/kielbasa_recipes_sheet_pan2ra69.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://bazis-rostov.com/81626295477mt2rn.pdf
    • https://static.s123-cdn-static.com/uploads/4481839/normal_6000c202ebe26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabom/79024150248.pdf
    • https://s3.amazonaws.com/lofese/zilolekosegabarar.pdf
    • https://s3.amazonaws.com/wujanozo/degrees_of_comparison_of_adverbs_worksheets.pdf
    • https://s3.amazonaws.com/sikuva/aosp_android_pie_rom.pdf
    • https://s3.amazonaws.com/kibavutibeved/46293235950.pdf
    • https://s3.amazonaws.com/mozedijiz/bluecoat_proxy_deployment_guide.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_off000102da.bin
9c764bc30037cd90f6c3c9d3ea134ff801c5e86558fde4be8bf741c8e261aa15
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 5228 bytes
font_01_sfnt_off00011478.bin
1d8359d637229b0bfe45da7eaea47687d25e8f57b141323cf5a49dd52d36c8eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 10768 bytes