Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c92a4b0035dac3…

MALICIOUS

PDF

67.9 KB Created: 2020-12-16 06:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 05932f33025e24288588d670f5479102 SHA-1: b9db57352ff0fc208fe61871a7c68e4dea13134b SHA-256: 40c92a4b0035dac325c87039ac70a6777ad69855a93650ea396a442ce09a5c5d
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms and redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. These findings suggest the document's primary purpose is to direct users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?utm_term=this+effect+requires+gpu+acceleration+premiere+2020 In PDF document text
    • https://kanavedofi.weebly.com/uploads/1/3/4/7/134703074/dupolux-roroxubobexaz-wuwixenix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fc349e48e3cd.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/gidoz.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/joterige/34666514542.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/google_slides_templates_for_math.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/84743038161.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/cambridge_lms_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/lejomajoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b8db7d-72fc-45f7-bb9e-5be16e0a95cd/tc_electronic_flashback_2_delay_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/every_good_boy_deserves_fudge_album.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/super_mario_odyssey_guide_lake_kingdom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c8b0f5-7bdb-41ff-8477-b863b089d0f6/second_middle_passage_apush.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_off0000c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 5776 bytes
SHA-256: 1cab0d5df9e29e0a368be58808389b34263d96fc75535003f8ece742e56c38db
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 12184 bytes
SHA-256: e43f6fa3744b911f6fdd52d789da020b4a623ffed8301d3244bb4ddcf6b055ce

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