Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3c337bbbc70c14…

MALICIOUS

PDF

76.9 KB Created: 2020-11-24 20:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 64e725eea66dcfaeeb6c017ddf1bbf06 SHA-1: da8b51138eb7b670280d563a62e2b648275e9642 SHA-256: 7b3c337bbbc70c14b5a5b786eb0814781d1ad127b7f45c34f29cb4cf20d5167d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=alien+attack+team+3+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5fa638eba0089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_5fad291a95b2b.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/panumewokirafam-nusojukijikilo.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/cc728ff0b7921a.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/f24ad4f4-c607-480a-a4ee-d042f0d67aa3/mize_attendance_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb623428-1145-40ef-af2b-751478c12732/47415228907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f6ee40-4b90-4b45-ac45-05d341d9400d/55532884782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2939827d-deda-440b-9fde-2f64b6def067/14316164280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b841ca5-0bbc-4d13-a6c1-9ed2cd8d7e7b/37034682407.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/44876092464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b82281-1978-4e79-8332-d8c730631df1/48261832101.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/objeto_de_estudio_de_la_filosofia_del_derecho.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 9368 bytes
SHA-256: 218ee6ab053e0426b58cb1949d76a03b9b1c4f621f98d5e74e4e3772a4dd7af7
font_01_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 5168 bytes
SHA-256: beb82e93cac3a1c70ce7b8424df4e9da6f298f10188077c0f30827af137a7673
font_02_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 10472 bytes
SHA-256: 410e0e691cd65bfe6ddb463a61566c730ba1996fa89c8fc41481bf3cff54002f
font_03_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 18444 bytes
SHA-256: b9324c226fb4537b11c23167d8d059bceaea8c5dbe9651c655f7a6ea7a8b250c

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