Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5ddd525580335e…

MALICIOUS

PDF

84.7 KB Created: 2021-03-30 21:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 026ef0c6c9db59ad01dbea2d92dde061 SHA-1: 25f58bd035b3be6c32176ac4fac1469cc9756dc8 SHA-256: bc5ddd525580335efeac539579efeba039942e10decd35bde518da536e4d5cd9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://baarspo.ru/award?keyword=celestyn+freinet+pdf PDF link annotation
    • http://videohost.space/el_cuarto_de_atras_carmen_martin_gaite_resumen_por_capitulosgcj48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5fc8c718424b1.pdfIn PDF document text
    • http://bevibopo.22web.org/fiwabewedol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_604105856ee55.pdfIn PDF document text
    • http://masito.space/mavuwililomu84zo.pdfIn PDF document text
    • http://termometr-medikal.site/rirakiriporivaxs3h96.pdfIn PDF document text
    • http://parralax.net/wenigewewewirfkfr0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_601f687eaecc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5ffa50a568bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_6062f53b540ec.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://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_12935fd7f1f44e8b9bf084d2477e6d2c.pdf?index=trueIn PDF document text
    • http://gugivuma.rf.gd/26031229686.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_4122d2cba686486094f5b42cd0d1b119.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff08f8f-526c-40a5-99bd-6738b90e28e5/how_to_add_traffic_layer_to_google_maps.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_af4ab5b9ee38426f98721b220b074cf2.pdf?index=trueIn PDF document text
    • http://likikefiziz.rf.gd/fawope.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_87acfb6c614a4d46ad63fffa5af772df.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_d190225cc1f647a494a48a604f45a162.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b1ef37-ff97-4264-8c72-442ff5d8d2ba/extraordinarias_mujeres_de_la_biblia_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41650700-e583-452e-9073-718ab75054e9/tufugazibus.pdfIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_e76d37e486584a76b4e9f29d9794f8bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a02f93-8082-46aa-82f1-26fe3a309f06/how_to_clear_error_codes_on_kenmore_dishwasher.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_7873b4efba6746feaff64ec07242cb07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4e916d-9a3c-49d3-b3b3-e08ad9100446/sunbeam_cool_mist_humidifier_filter_replacement.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_f2895d4bdc1746c08251edf4f95f65e7.pdf?index=trueIn PDF document text
    • http://vewemisesafi.epizy.com/como_citar_un_autor_corporativo_ejemplo.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_4cb1b4e8d1be45d39ce52f92aba9cc15.pdf?index=trueIn PDF document text
    • http://bubezowi.epizy.com/rockstar_so_slow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 4628 bytes
SHA-256: 40f1eeebfe1afea3653d6284422ed5eb5a87a6d4e9c64e4310515e2653f4f262
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 11624 bytes
SHA-256: 91b9b5ddf78abecf6f350220afec9276c617ec60d0b008e7dd3bf9c4c779a26a
font_02_sfnt_off00013576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333