Malicious PDF — malware analysis report

Static analysis result for SHA-256 76838179446f4136…

MALICIOUS

PDF

84.5 KB Created: 2021-04-20 11:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3bf7b096107b4dae390f06b73ca2e68f SHA-1: 53521b4baae90d0ece9197a7a2d6f4522bb4cef2 SHA-256: 76838179446f41363be6a5c17579b9564b0f4f0d986bd9dffaac2c293ccd973b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=what+happened+in+american+history+in+1900 PDF link annotation
    • https://rusenudiwupelor.weebly.com/uploads/1/3/4/7/134704890/sofigulevawawoj-funozo.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/wuxapidinipak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_60183d84235a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5fdf957e1eb56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fef7acdb8bb0.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/juvil-mejukur.pdfIn PDF document text
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/vewejefizapididiwupo.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/1831763.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://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_48b182e612054baa8e7d256bf19e4240.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da357ec-9e57-43b8-ac11-3a3befadac34/96129228200.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b1d7282d49cc464988341c59f1e26ba3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d326a69-f2a1-4738-9b35-38f77708b804/triangle_for_trigonometric_identity.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_9e23ed388d4349b988bf2003d739293a.pdf?index=trueIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_beb01952338e48a3a5b84e99b9c5b9c9.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_8283f0ff579f4b408b9ef2cf1aad6614.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_19285e4e38fa46bba12244392144b978.pdf?index=trueIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_af37e2f7812f4a38a90174a00670848b.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_99aae6d226614b4697da4e3ce833842b.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ccdf7c53136847d8bd86439126600d3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e01841-0c34-45d2-947f-955de03111d3/34438066900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead1c9be-60f9-4b4c-9f35-7b6c742a698f/yandere_sora_x_reader_no_game_no_life.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_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 5536 bytes
SHA-256: a7e25b6ff2c9d1444b8d842736dd064245e09236cf5dcf2b57e85197c7f7f38f
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 11676 bytes
SHA-256: 05013a53a5154aadcfa8192fec2f37e3209315d8da96875d56a5c69e60b97284
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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