Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ca3efd2f044b88…

MALICIOUS

PDF

117.3 KB Created: 2021-03-22 04:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 65da5623e9878252c3f0d4a88241d986 SHA-1: 561009699c561544e6d1cae9c5e8014cda90eb67 SHA-256: 39ca3efd2f044b8811020200182dfb5e0b841bb111b953bddd5a5a42973423c6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/award?keyword=american+dream+definition+pdf PDF link annotation
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/jagilumavekoxa.pdfIn PDF document text
    • http://mazers.fun/39842543570tsh7t.pdfIn PDF document text
    • http://reduslim-ordina.site/zegenugedawisukugivuvosamhbp6c.pdfIn PDF document text
    • http://help-copyrighteamservice.com/478003701829t9g1.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/2279527.pdfIn PDF document text
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/disalikelawinudu.pdfIn PDF document text
    • http://ijmalan.xyz/244398654209u99s.pdfIn PDF document text
    • http://repair-telefonov.ru/fubuseduwakitamusokpa4bt.pdfIn PDF document text
    • http://dwatches.site/piwofivavy37g7.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/3177585.pdfIn PDF document text
    • http://forpost-electrica.ru/3453630741391837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_760ab064baeb448cb5084c710a0e1116.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_393764cd659442a2971a322fd175ab96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c978bea1-6a24-4aa7-b06b-fd1b0a67a2ad/38624222793.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_a39d98aea73c41dea6e64b3a246511b2.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_eeb44b8aad514f8a9eafac81f53e0417.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_9ec5ce8af5bc40aeb15018874a7f2a06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ef503f-18d2-4f96-900f-efdd88ded996/xonogepujowekaxixiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd0398f-9d54-478f-9ad8-2c7cc71c4f58/fortaleceos_en_el_seor.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_82227592f2404889ae7f0d7e9c6eae8d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE0 5080 bytes
SHA-256: 2468251fda5f24e8075f9e467ab131789834feafb835e519ee88c15881b4b1b4
font_01_sfnt_off00019f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F13 11928 bytes
SHA-256: 9743fe988754a415740965316fbb7d04e9624500f0e7eee61cbcd1ef63f50fe1

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