Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1f524cc419c675…

MALICIOUS

PDF

79.2 KB Created: 2020-12-16 22:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f92733366e171cdbe8762c5f4486a64b SHA-1: d3d977f1ffe76792934675537dde397265f3e1a6 SHA-256: ba1f524cc419c675af17ceaf9df95d1f349e21ba928fea3b4690c04095926116
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on link farms like weebly.com and f-static.net. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?utm_term=north+farmington+high+school+yearbook'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=north+farmington+high+school+yearbook In PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/998611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f88a82692e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_5fb2edb5509f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f9195b4f2cf3.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/ridifut-tepolafodex.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/1734890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_5fbb239aa6fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa56044040ab.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/mebiwavij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_5fab2eba83bab.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/nagofazibovuludizaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5faab49a18017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f9914df1ec4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 5572 bytes
SHA-256: 4e3ec51e8ee408c42dec07510d30c87926ef3a7cfa2b3c493cbda3b90646c7f1
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10552 bytes
SHA-256: d9cba11098b5bebe4b33361a4adc1fe4a7f962511a933b39ee327245ef080a81

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