Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bc72a67a57a5f6…

MALICIOUS

PDF

82.8 KB Created: 2021-06-12 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3169cc7cdcfe5218a871d5606d166ad0 SHA-1: ad4605e04a7e4d71ccd339634fae411ed151b60d SHA-256: f2bc72a67a57a5f61fbcd2fca7ce8b91b4ec5521a5c6a7dae73c3ebc732664e1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming technique. The primary URL, 'https://nomylo.ru/pbw?utm_term=bbg+workout+program', indicates a lure related to a workout program, likely intended for phishing or scamming purposes. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/pbw?utm_term=bbg+workout+program PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6055784394f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_601a9d3187283.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375890/normal_60b5eb86bd2f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_6033e6a2bc1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_60394a81741b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_6051a0c94d8f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60671f4297389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_603a43da7ff52.pdfIn PDF document text
    • https://lenukomezol.weebly.com/uploads/1/3/4/3/134311572/wakezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_601813a514c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_6061aea91be3a.pdfIn PDF document text
    • https://nanagupuwaxa.weebly.com/uploads/1/3/5/3/135322083/5726575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_6021a829d7379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_6026bd41b665f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad91875-3ab0-4890-a16e-dd1dfd56b427/95801344042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126de35f-4e64-47b9-82d7-2e08b6f5adfd/how_do_i_enable_hdmi_on_my_panasonic_tv.pdfIn PDF document text
    • http://najajadux.pbworks.com/f/jelipowitokexex.pdfIn PDF document text
    • http://kawawuvaken.pbworks.com/w/file/fetch/144947973/solving_rational_inequalities_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e14fc4f-bc48-4b19-b6d7-c3de9724061d/numark_mixdeck_express_virtual_dj_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c63a60-9528-4bf8-b671-2f07e84b7deb/52783485106.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 5276 bytes
SHA-256: 3d66428a9a1144fc1448fb7c2536b59faa38cfffe9d35170366f86b5b9bab513
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10876 bytes
SHA-256: 1baed8d528cd82b654d98c54ef4757a20007e8b9f0ec34cd80a28b8d6ada3627
font_03_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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