Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e7ba7519d0d828…

MALICIOUS

PDF

67.0 KB Created: 2020-12-22 08:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 96eddcd45285ede9b426c0aa7b14308e SHA-1: 77264085b67d41e2b3863ee6b8a23dd8b905bbba SHA-256: 77e7ba7519d0d828cf3627e8d79a16193a6571ccb8b8d4e0c90950b28d7132b5
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, likely to funnel traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=christmas+mandala+coloring+pages+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5fa5157e929ed.pdfIn PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/xakefanodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f8d7c09b0d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5fae6a04ce378.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/xibemusexomaxotoz.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/d2cb5cdadb7dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f94d8937a951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0f4c2edfcd2bda93c804/1606225741614/87540852164.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2eceac6d96458362f573e/t/5fcebc59e0c378597cfb7111/1607384153692/thai_script_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d50b4c-9723-476f-b3c5-7ab320dde0d9/rupitetuditiwunob.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd525e5b7bc966055e3a6f/t/5fde00cb2629b066aba95075/1608384716222/el_coliseo_romano_informacion_para_nios.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f24c403f5353fd95fd42/t/5fc28be15147b1480485aac3/1606585313862/scandinavian_furniture_nj.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 5476 bytes
SHA-256: f7355fa5e7a9129aad9b8b477be1ee1bcccc1cb778b19809f168a18db5f9d4b7
font_01_sfnt_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 11132 bytes
SHA-256: 5b899ec26f6ce76365197069ae2e6eeff3ef62f9b96fc096420cf30b1a8d4395

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