Malicious PDF — malware analysis report

Static analysis result for SHA-256 402b7dfd54b36f34…

MALICIOUS

PDF

65.8 KB Created: 2020-12-21 12:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 723c5da261e9fbaf856aba8125bee200 SHA-1: 193eb3a41879fd0a24baa82a55857ed2cd131943 SHA-256: 402b7dfd54b36f34cfd4dde484c578949d3bd05815f149e28a728ad6352248b4
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDF files, indicative of a link farm. One of these links redirects to a known malicious domain, and the ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The primary goal appears to be directing users to potentially harmful content through a network of linked documents.

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://ggtraff.ru/strik?utm_term=plain+city+post+office In PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/5536910.pdfIn PDF document text
    • https://pofivotelovij.weebly.com/uploads/1/3/4/3/134310926/5411060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_5fbf283e32937.pdfIn PDF document text
    • https://xirofagoxo.weebly.com/uploads/1/3/4/5/134576207/34fedd300342bc.pdfIn PDF document text
    • https://mugekezozo.weebly.com/uploads/1/3/1/6/131636766/mapovipixukewop.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/5fcecc3225f96d1b32d21edb/t/5fd6f69cffab5d3c560fb806/1607923357703/rutijuku.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e698cd1e280355d44756/t/5fcb9e341415195da08913f9/1607179829312/free_zedge_application_ringtones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19865be4-67a2-4a21-8815-c955f3988871/what_is_colby_jack_cheese_in_canada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc185bea8793968640cb600/t/5fc3d2719d7936484002c1fc/1606668914613/hydrogen_peroxide_therapy_testimonials.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13274cd1e280355d63052/t/5fcb07898dcc5603beed4361/1607141257874/online_recharge_lycamobile_germany.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10ac260f2895dc1e8a19d/t/5fc23bb52dd96f5918389e46/1606564790150/nudujiwofojejunude.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/89748807841.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/logo_quiz_answers_level_118.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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 5016 bytes
SHA-256: 814856c235a5207e8891cafda17ff9727a2128d83fb8bb629271ac99e53eb014
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 10152 bytes
SHA-256: 4fce99fc09610747eaa8c6888798a56c0adcbf5f1fbfe6f121ce7642ca452aae

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