Malicious PDF — malware analysis report

Static analysis result for SHA-256 504ee41a3df5528d…

MALICIOUS

PDF

82.6 KB Created: 2021-06-05 16:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5bbb703bec863c5833e372803fddadf5 SHA-1: a8bb7d8c749bd8c1e070e8fc3541b89b38bc0da2 SHA-256: 504ee41a3df5528dee11b8dd0234105f0fb63389614e0549da1bf1f2a9e60196
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://crysiq.ru/pbw?utm_term=instalaciones+de+gas+becerril+pdf', which is likely part of a phishing or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://crysiq.ru/pbw?utm_term=instalaciones+de+gas+becerril+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422136/normal_60384bce0465c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_604bcbe9c5694.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/vupifutifawaxosu.pdfIn PDF document text
    • https://naxaludegefow.weebly.com/uploads/1/3/4/7/134776308/soxopu-somivodatoj-zevawinogijo.pdfIn PDF document text
    • https://xulobefopit.weebly.com/uploads/1/3/4/3/134349373/20ce9cf04d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373749/normal_5fe39132dfcdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495997/normal_605219b65d84d.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://uploads.strikinglycdn.com/files/82470cbd-f738-4155-b3f0-fb28caee30f6/lafometi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5429bf1-f6a3-4d9d-ad12-441872a47612/97556825371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88af6250-151d-4035-9521-a29e53266840/the_reserves_of_beavercreek_rent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bdec08-9232-48c2-bc91-430147ff7b4e/85148501087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66094e7-3982-4188-b4d9-635231055ae6/how_to_fix_a_small_engine_with_no_compression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60dcc6eb-9f3e-4acd-81bc-fa3d6f2f43e5/nidevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fd166d-1f75-4884-8ea3-afb398f9de96/bexidipewanoranorovogole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3186cb-8438-43b4-808d-90487ce44bda/godow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6632f836-d123-4117-8720-c5529128bf34/soundcraft_ui12_ui16_power_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28e7e92-63a6-4f55-ae6e-2a9cfa364ce5/tewusepigabodizanolalaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936fe319-455f-4c86-8d53-1463555063be/ripusanemasatepeluza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c91a86-12ed-44a7-aa99-1b184636136b/83382816920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b400b4d-0923-47b0-b350-4cc918b9b0fa/specialized_speedzone_sport_wired_computer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06de5be2-c089-4d0a-ba9b-ab835176168a/sozerenadigirovixobof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df95fe14-26e8-442e-9c22-362767175e9b/fejadudavuvajin.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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 5188 bytes
SHA-256: 9db2a0060ee027617b7f4e5c0892451e3ceb403324778c3e0d489b7910652393
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 12320 bytes
SHA-256: 57cb8877dc2fd4d92e918eef43192cb31fad0493cb593995a24ea906b73daff4
font_02_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34