Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f856acfec54331…

MALICIOUS

PDF

74.8 KB Created: 2020-11-10 19:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a4982c3205f71312e1072afae466c0e SHA-1: 9c9e03aefa334139542b7cd90609abffec847dd0 SHA-256: 51f856acfec543317d80091d878e2a9d3e3308e53372c77869c74976bdc2d4fa
164 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. It uses an invoice-themed lure. 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffi.ru/123?keyword=fdot+toll+enforcement+pay+online PDF link annotation
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/guvetexenunusud.pdfIn PDF document text
    • https://latujajadaf.weebly.com/uploads/1/3/4/5/134593938/nebunugedowimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5f9fff77d3e9f.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/2702791.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/gotad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f9c1b00d1157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6995e29c-01ef-4b82-99d5-9f32dbe3fdaf/6870086271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c092398-de8d-4ec6-add1-8215f3ddfb79/command_and_conquer_generals_no_cd_patch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00dffbae-6429-4542-ad10-2752e79a4bb6/ethics_theory_and_contemporary_issues_9th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373a54a2-7a44-416b-ab60-40d2ec4a383f/bawafaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5965705f-5333-400b-b3af-956f86b29884/85171490772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391b698a-c1b3-4c60-86d9-f5e5ea981efe/xipuvimesudekipusabeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6e3af1-dadd-415f-8e9f-897d05407b4f/96924369531.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 4968 bytes
SHA-256: 6cbc31a6934dd489611edd2b2f4202f6701d88fc82aae95842f93682304d4e38
font_01_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 11352 bytes
SHA-256: ca9ac27c65151d8c87403d43b1204f0a8c4b780322130601562ae44cc018ce62
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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