Malicious PDF — malware analysis report

Static analysis result for SHA-256 606c1b9e13611c79…

MALICIOUS

PDF

80.1 KB Created: 2021-01-06 14:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 05242ba1d22a4f203e1d58331780d65f SHA-1: bb2411035289ac2057dd39a87490e38cc207f297 SHA-256: 606c1b9e13611c79835925ad40c160bc0cff095ae164003e49f0d4f11684ff81
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely intended to lead users to download further malicious content or visit phishing sites.

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://traffmen.ru/aws?utm_term=bootstrap+table+styles+template In PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5fec1cbc258fc.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/cd338506d866cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_5f9fc1b55944c.pdfIn PDF document text
    • https://zisumujabi.weebly.com/uploads/1/3/5/3/135315444/c77045ac249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f9b5ddfe6f06.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/jafujasiwetid/jubumamiponutijami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e1b841-89fe-480c-97c4-dad03e68b855/bovovoruduwudisaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c64d05-1026-4ac1-b034-6d12e91b8a8d/drug_therapy_in_nursing_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc7b21a-6b46-4d07-8adf-2eeda9ce3732/29280170969.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/capitol_theatre_nb.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/59847406915.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/minion_cladogram_worksheet.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_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 5256 bytes
SHA-256: 32798b5d7d716cd99a55a37c5f20d7483a87e6c709341a08794e09ae9d9f2204
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10852 bytes
SHA-256: 843215a95c44ba5d1a794555810de7da800c3579040e4fbebf3da9f51c2dc8d2

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