Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c489bf49b157169…

MALICIOUS

PDF

74.8 KB Created: 2021-02-15 12:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a978f2d56413da709aade462d575fc5a SHA-1: 04b4fb1e7005f02daf2c8200b6cfc557b0467d62 SHA-256: 7c489bf49b157169c43521ea46bedd9c1020effc98d8c7cf3e70b9d4f0f0229a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://bologen.ru/123?utm_term=twilight+zone+episodes+free+streaming', are likely used to redirect users to malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=twilight+zone+episodes+free+streaming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6016e8ac31461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_601d54a73d79b.pdfIn PDF document text
    • http://eliyalte.com/mirtazapine_for_dogs_with_cancer8buey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff6964b3557c.pdfIn PDF document text
    • http://redtea.space/27253764851hxqc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_600b44cf42c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_6028fdf5c9a0b.pdfIn PDF document text
    • http://hihikane.space/tera_crit_factor_vs_powernl7tj.pdfIn PDF document text
    • http://sarkife.site/salsa_dance_steps96dka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_5fd2a21ed584f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fc59171bd539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_5fd1e51c4542a.pdfIn PDF document text
    • http://world-wildshop.com/fedekotu09qds.pdfIn PDF document text
    • http://supermagazforsale1.xyz/icao_cargo_manifest_formatmxktg.pdfIn PDF document text
    • http://apsdd54gfv.xyz/kdka_traffic_reportersoqwl9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/stock_aging_report_in_sap_b1_query.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/amazon_eks_terraform.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/90790899194.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/coschedule_free_template.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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 5548 bytes
SHA-256: 55fcaa7aee8e98d20074d5ee455f9eaeaca03af350724c0348d764e2921246f1
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 11496 bytes
SHA-256: f4608a7ca805220a70264bdb58b8b7114647970f081bc98ea367e3716ab0350a

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