Malicious PDF — malware analysis report

Static analysis result for SHA-256 724537ef48fc4b2b…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 19:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ac0fdb58321815d585382453169e1da SHA-1: 12d5d4a070fe29853667f0ec9546513f1794835e SHA-256: 724537ef48fc4b2bc29da41562a67e00073a95e0c8822cab01e52ca96606bda9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm, pointing to various PDF files hosted on external services. One of the primary URLs, 'https://jumiwimov.ru/strik?utm_term=are+trs+pensions+taxed', suggests a lure related to pensions. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=are+trs+pensions+taxed
    • https://cdn.sqhk.co/zuxedanafowa/ejhKhag/ergo_plus_rula_worksheet.pdf
    • https://cdn.sqhk.co/bomemenun/WiiMEnQ/17702049658.pdf
    • https://wufirojotuxo.weebly.com/uploads/1/3/1/3/131398242/9612803104a51db.pdf
    • https://gopojobazisedi.weebly.com/uploads/1/3/1/4/131436977/6336780.pdf
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd2fb687b931.pdf
    • https://cdn-cms.f-static.net/uploads/4392220/normal_60557b4195cc2.pdf
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/pelaxobakajomazamav.pdf
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5feca0bef3469.pdf
    • https://cdn.sqhk.co/nixafusoda/mjc4tid/zigikepulobutimeturu.pdf
    • https://static.s123-cdn-static.com/uploads/4379960/normal_5ffc72b5afc67.pdf
    • https://paxubemimowam.weebly.com/uploads/1/3/0/7/130739876/7c60a12848d3.pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/kuvafagunax.pdf
    • https://static.s123-cdn-static.com/uploads/4488822/normal_5feb6eeb2ea82.pdf
    • https://wubeponasi.weebly.com/uploads/1/3/1/6/131606197/xiveti.pdf
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/966a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dabatisew/caterpillar_generator_operation_and_maintenance_manual.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/tufojir.pdf
    • https://s3.amazonaws.com/sejakopa/lazakowu.pdf
    • https://s3.amazonaws.com/wanasuvedigo/danuzuvojiwevojosa.pdf
    • https://s3.amazonaws.com/woneketelak/topukebuvozamegen.pdf
    • https://s3.amazonaws.com/wenobagupexekap/jurotaz.pdf
    • https://s3.amazonaws.com/gizonukorad/mojesolomapaji.pdf
    • https://s3.amazonaws.com/zuguvoxoki/wofewinunupiwepisidalaver.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_off0000f647.bin
08119705d541d09199b8bf7a1d30c884d08a75fa62972059d0537f202b1f8826		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 4980 bytes
font_01_sfnt_off00010743.bin
1bc8fc95421e1d1b0c5d453709121e622dd9b00896ec56ce69286ee8a9b3c692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 11112 bytes

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