Malicious PDF — malware analysis report

Static analysis result for SHA-256 7debfc73824b4b9b…

MALICIOUS

PDF

96.3 KB Created: 2021-02-19 02:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ed24413a843402fb9f45e4a3860c607d SHA-1: 9f8c624ed9a93e9e3394aa4170a7a87242f03705 SHA-256: 7debfc73824b4b9bef606542d07598c9ca18a303270f4049f1f5344180efa829
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a tactic to distribute malicious content or phish users. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

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=cbt+worksheets+for+suicidal+thoughts PDF link annotation
    • http://persequenteamsohbet.com/jaxamezunarasfm0kc.pdfIn PDF document text
    • https://cdn.sqhk.co/titolegun/KXTM9hh/universe_360_view.pdfIn PDF document text
    • http://ledy66.net/ruwetv4d3z.pdfIn PDF document text
    • http://e-devletodeme.net/modenetujoremosavilinalj2fb.pdfIn PDF document text
    • http://tosety.xyz/sefaxegobukijuxekavuwefo2f2bp.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/jlwhzhh/35017867251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_6017c0824fb85.pdfIn PDF document text
    • http://instapriz365.site/zamowutenabojotabivofcknpr.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/3969960.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/widetunipet/maggie_valley_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/free_last_version_of_whatsapp_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/best_free_bubble_game_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/47626232950.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/affliction_lock_guide_8._0.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/grid_website_template_free.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_off00013c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4F 5484 bytes
SHA-256: 8abf28f7f85fd287e05c65fe2e9d598c35467ec4da1e3ca872fd96b228c1e5d0
font_01_sfnt_off00014efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFE 11100 bytes
SHA-256: 88536ddb6fa705ef31c67cad4891136903aa755d84cc73f6a75b24804d019504

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