Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a4e675ac4ba51e…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 07:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68ab1b3fbbde01652e51e30724007c99 SHA-1: 7655d149ce6272faee97523f01d6f87977ee3fd5 SHA-256: d4a4e675ac4ba51ee45d15f5ff10b5e655dec0440a1cebe020dc6fde2a94bc75
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a primary focus on `https://jottigo.ru/wix?keyword=mision+y+vision+de+un+restaurante+bar`, suggesting it's designed to redirect users to potentially harmful content. The PDF structure and the presence of external URIs point towards a phishing or malware distribution scheme.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=mision+y+vision+de+un+restaurante+bar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5ffb7f217d10d.pdfIn PDF document text
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/fc5dfc3.pdfIn PDF document text
    • https://xeresitemuja.weebly.com/uploads/1/3/5/3/135311884/9304861.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/jgfgegc/64273655176.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/fDFohh8/16155000685.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/tonalofagelobikaduja.pdfIn PDF document text
    • https://wufowidujexo.weebly.com/uploads/1/3/5/2/135293423/relowifizegilagu.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/miephgQ/48184479163.pdfIn PDF document text
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/35c3cf979.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/CJlicgd/verizon_visa_card_benefits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/bio_medical_waste_management_rules_1998.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/bokupagawig.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/merry_christmas_font_style_free.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/vidmate_app_in_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/b_w_formation_duo_singapore.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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 5092 bytes
SHA-256: c73feaa2b072b93905e23a8750ec36ae1cb8089320653164a9ef2cc0c2e884e8
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 11372 bytes
SHA-256: a3ec5a64b069fc4f2b10e858601e52bee6b6ea72ba66e8790c66458bb2103440

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