Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea20065372503df3…

MALICIOUS

PDF

88.4 KB Created: 2021-02-01 16:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ec4e7a8a070d5b1fd32054a13749ece5 SHA-1: 87bd2c3043247108ef4ee7a62d118d43901b969b SHA-256: ea20065372503df3f46451dc6f6098c28b9d60c8bdc629e8d7285675917fab47
156 Risk Score

Malware Insights

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

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 malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely used for phishing or distributing further malware.

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://jacksth.ru/123?utm_term=main+quest+skyrim+unbound PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5ffc71d87c8e6.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/5991136.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/ggfHSoG/horizon_hobby_order_tracking.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5fdeac464e8c4.pdfIn PDF document text
    • https://cdn.sqhk.co/benadujeju/b7jfKjc/top_10_lists_trivia_uk.pdfIn PDF document text
    • https://legutuxubumid.weebly.com/uploads/1/3/1/8/131872058/waxekizomap.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/pilimexewen.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/nafekubikumuvit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fedced27304b.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/7eab21a96bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_601392581841b.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/GjfPid1/running_dog_live_wallpaper_2018.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/sazixipame/facebook_apk_for_pc_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/33629540431.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/kaibab_deer_population_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/another_earth_movie_in_tamil.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_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 5376 bytes
SHA-256: 78ac2ab716abf8d5e3066b398ddd184a4cf01d3c438338737a7d49370fdcf4ed
font_01_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 10744 bytes
SHA-256: cc853f21e0e231d58c4bb68746f2c0a7e7da5e18d8a5cee00efb5287603275b1

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