Malicious PDF — malware analysis report

Static analysis result for SHA-256 55725b2b1c1dbe81…

MALICIOUS

PDF

90.0 KB Created: 2021-03-30 20:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b35d9b23da7831fc163ebf00606a14b4 SHA-1: 57cfb8dedf875005676491a8e579dde3387fb3aa SHA-256: 55725b2b1c1dbe814dba76184fcdacfe56e1bdc369e703afde64558a9dce1077
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for phishing or to create link farms for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://druttle.ru/award?keyword=warhammer+40k+codex+pdf+8th+edition PDF link annotation
    • https://nukegakisuwagaj.weebly.com/uploads/1/3/0/7/130739250/522409.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/jiluger_jeneg_gosevoxupi.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/bgiBVhh/jekuxodogenipebesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_60387e8d09616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_605315e777401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_5fe736b27dce6.pdfIn PDF document text
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/mubusalub-jinovimup-vukofenux-dukifeseberoru.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/gjsgggi/lusoburezezepugajomitu.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/2468223.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/batofolusekikox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5fd8f97aadc1e.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/wujapu/36935948651.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/is_flipping_houses_profitable_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/angry_neighbor_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/laravel_carbon_in_blade_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/effective_communication_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/outlook_365_office.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/56127200492.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/fejenajidulumixemase.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/affidavit_of_loss_form_137.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/52610074234.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_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 5752 bytes
SHA-256: e0a29b73b657493571e445525805e89594a89bacb74d9a96df5b896ae949d942
font_01_sfnt_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 11164 bytes
SHA-256: 7e71836cd2bef53798025c28754aab284ef6fae133c958a77b823fd84e517b6d

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