Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d1574e1797bd08…

MALICIOUS

PDF

70.7 KB Created: 2020-12-22 15:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 153f48f6e4a6b344b768d468451ec5e3 SHA-1: 9de7a574e0b91adef2956c50c290fbad563c7d45 SHA-256: c8d1574e1797bd08d21645395ff3c391f207dea334ee697727ba0a3214ecb028
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic indicating it points to known malicious infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic suggests the document is part of a network designed to distribute malicious content via numerous linked PDFs.

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://traffking.ru/aws?utm_term=bmw+225xe+iperformance+wiki In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390323/normal_5fdc979f9f1e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fc94234eaa08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fd680e2d1a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5fc95dbf08c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_5fb2ad498f45c.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/17fb220fc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fcd8c39ce483.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/557ee7a0-9d90-4b70-a58c-57883c0a3c9f/tujatorubomigakuwawaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/analogia_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7632f6a-b787-4915-9699-2734033659e9/70772378707.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/water_hose_connector_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fbff15-f559-4efb-8ed8-e0da2cfd62e7/xunolokaxizawapofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa87a5dd-3e1f-4768-a292-a5653cd7eb37/32340134820.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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 5480 bytes
SHA-256: 3775b48f188d5b478232b6281d5484cfa5a18675ff15edd382e0fd81622a60fb
font_01_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 11976 bytes
SHA-256: 3b6f734849c7a40a674ea200150a66fc2f5bbf6bf0b6f9fe6bf1e601447ead3e

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