Malicious PDF — malware analysis report

Static analysis result for SHA-256 6debaf2183cf7693…

MALICIOUS

PDF

69.6 KB Created: 2021-01-05 20:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d62a18a5d08480668ba820ad3ecf6e11 SHA-1: 773f0b537afff1b131ead6bbe234aab30c7894d6 SHA-256: 6debaf2183cf7693b76e6315e0b8baba75fe213a040b972170fe87ec4b6b986c
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for malicious redirector links and a critical ClamAV detection. The embedded links, such as 'https://traffine.ru/aws?utm_term=ordinal+numbers+for+kindergarten+worksheets', point to known malicious infrastructure. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=ordinal+numbers+for+kindergarten+worksheets In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc799b50b482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369783/normal_5ff23b613c99a.pdfIn PDF document text
    • https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/1433931.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/d79fab9d-0471-49d7-8e48-58ea89a294c9/66576713833.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/algebra_2_glencoe_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bfdd65-6de3-4dae-94b9-3b3a09559146/didedofokij.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/zupopibupudukosunez.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/nifowijabogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03f025e-a187-4bcd-bd74-d696fade8729/26733372737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cb6934-4124-44b0-9275-402eb1995e84/zomajuwisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478e66e3-925c-4612-96fe-0618a77ba70a/88631222528.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/i_got_rhythm_george_gershwin_sheet_music.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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 5644 bytes
SHA-256: bdc2865894757180fdfda0eeb5a90841eed8b919d8d2af33335e2cb006c63e3c
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 10696 bytes
SHA-256: 320d0d9f293e4e0a1e4ea9da0cede257a65328cdb9e08b01f919a3bbc8eaa0f2

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