Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd0233455f7bfa7…

MALICIOUS

PDF

84.6 KB Created: 2021-03-05 00:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7d330119a70e5eeeebff64436c568173 SHA-1: 6c25e1067ee23920dd748b0ec8c470803bf0be72 SHA-256: 1fd0233455f7bfa77f58f81e6e8014bb1880a5ecb03e0457fa264502852eb3e8
186 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, including one that appears to be a lure for permit test study information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+to+study+for+your+permit+test+in+georgia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60139d6d169fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_603690793134a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_602231121e036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fd0ea4d2ae1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_60327ba52fca0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_ab1b5edc493545d9b57216368efdd9ba.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_abc285b1d7d642de8b601f410140c2db.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_d3e3064d2ba849a3b6e640d91e1207bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/johnson_johnson_annual_report_2012.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_64c68dd3946245ca80d64a0c963f5885.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_cd47dc97f9ff4a5f9282377bd97867ec.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_c88cf9b423044bfaa5a825eb96b9dba7.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_0f43dbcd70a64d74901cfe4729aa39c1.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_94cdbcc8c17f4c9b9e32df07828df76d.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_49f2a8689296460bb8222d8c454a649b.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_b42ba5dba2d949f18cd86df70f1c1dc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/gdpr_checklist_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/what_does_f_value_mean_in_camera.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_67087a2231254e4dbc4600e72229077f.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_03aa7e13d8ef4e8b8d6467b579305805.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_df7f233296c747f5ac835e8dc98a8043.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/consecuencias_del_bullying_escolar.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_0796752f7c02437aa1a9e506c068c294.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 5364 bytes
SHA-256: 1f7e4c2ae02159c9df23df6aa432b11cf4183eb7574ce8c1d9a842221a2dbdc0
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10728 bytes
SHA-256: d6829dfc4d8f74e64a68c4e80ab0c4ddedc89af5d96fce39025616bce3f04dd4
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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