Malicious PDF — malware analysis report

Static analysis result for SHA-256 1930a6f43f7c7fef…

MALICIOUS

PDF

73.9 KB Created: 2021-03-15 19:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: de812be027f4981804078192f04ee4ec SHA-1: 0f75b5f945c4fa59bd4996f8805d61de003f46f5 SHA-256: 1930a6f43f7c7fefcd58935e55aa3b8ef49e85afb4c047f39b896bb6868f487a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document body, though partially corrupted, appears to be a lure related to boiler maintenance.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/aws?utm_term=how+to+clean+a+burnham+steam+boiler PDF link annotation
    • http://linza.media/cottage_food_law_in_pa4slsb.pdfIn PDF document text
    • http://biomaniks.website/how_to_find_code_for_universal_tv_remoteyxzfr.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/4873897.pdfIn PDF document text
    • http://kudretbozaci.com/ferry_denia_formentera_precio5lis9.pdfIn PDF document text
    • http://scriptbook.xyz/manual_de_paisajismoc4js8.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/jupudo_gafakoma_tawegukaf_fexifutof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_3ccfbc1a985144228092f14d3efdb318.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/vetemesabilisaro.pdfIn PDF document text
    • http://divojeniro.epizy.com/financial_report_example_excel.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_31bab41463c34e6dbec2187b96cf9744.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_f968ff8b5e024132a973964de5b4134e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/14152695101.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/24881372584.pdfIn PDF document text
    • http://meseraberutipi.epizy.com/gubemofagovinexu.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_2d59f72163dd4d08a5f0a94dfbb12056.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/love_yourself_bts_album_answer.pdfIn PDF document text
    • http://nedudumitariz.epizy.com/24608273110.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 5232 bytes
SHA-256: 4dc5fcc37465e8a0ee9ce0f54b05c844d062e9c72f31707c2e02afbe598cd04d
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 11264 bytes
SHA-256: 99c5a192e219df46919c989254781ddcbcad62aa232bdfbcf78718ffe7eaf9cd

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