Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e5d9d472da0e3b…

MALICIOUS

PDF

67.2 KB Created: 2020-11-24 07:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4cd88b746f3344688bf6fd9dbbf5eb2e SHA-1: d092df5237d111049a75714ee7ac54fe693b08eb SHA-256: c8e5d9d472da0e3b7f01dfc789ba3c81e0855879aaf8cf03b842a9271160fd5c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=supernatural+season+14+episode+guide+wiki'. Another heuristic indicates a PDF link farm with 24 external links, suggesting a broad distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • 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.
  • 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://cctraff.ru/aws?utm_term=supernatural+season+14+episode+guide+wiki In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_5fb7d9dbeb058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f8859d65aa6c.pdfIn PDF document text
    • https://seforurusux.weebly.com/uploads/1/3/4/1/134131879/815980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fb334278233f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fa5c08d0757b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3571a056-856b-4f60-96b6-a1df26215ed4/duck_life_3_hacked_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/pegodorekav.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/hanuman_chalisa_in_english_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/fonus.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/b._ed_full_form_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf50bbb-064d-49a7-aee6-065fb2caf5b2/fuletonevu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/buzosife.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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 5524 bytes
SHA-256: cf3974e59a9eb641abc630e1f16b3a38505a8dd2b0d12fe32de0617eb31383ee
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 10324 bytes
SHA-256: a228568e9a30ca5761030dd5f223671786395c6a94b1e67780250a43826751a3

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