Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a61dabd0353c6b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-16 06:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 40d2a261848344c2ec65618a35a5533a SHA-1: c09391cc7205013cc27b8606bd2976230c913226 SHA-256: b2a61dabd0353c6b69a2f1343c7241e8f3c27211e501c9b7dab478a96990b519
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 as a PDF link farm, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead users to further malicious content or downloads via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+make+a+good+powerpoint+presentation+for+interview PDF link annotation
    • https://cdn.sqhk.co/vituxezij/5ievi4t/classifying_numbers_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/ffdsxgg/tilikibotuguvapuvix.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/BifzeDq/67819271167.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/eVWhc1z/61200800713.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/i68jfxp/13111795169.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/4ghuDV5/samsung_music_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/hd1Pdge/formula_area_of_a_triangle_without_height.pdfIn PDF document text
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/d1e169b9c.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/cjghaHK/piano_dance_beat_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/c8SWIgF/pupinebasukoturi.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/Wlcbihj/lara_croft_go_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/Smjj31e/37541026831.pdfIn PDF document text
    • http://geekcods.com/69165416819oo94i.pdfIn PDF document text
    • https://cdn.sqhk.co/xemuxebu/chiBaij/digital_marketing_manager_jobs_linkedin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 5504 bytes
SHA-256: 35fac74f75c8c168d99fa0d82d30a598e66cb608c28057a3737f3d7f40b05468
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 11432 bytes
SHA-256: fc460a0c7e49e9e976df75196285ac407555a0503cb74e0516c381f2253c7c2f

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