Malicious PDF — malware analysis report

Static analysis result for SHA-256 231a2404556b8ddb…

MALICIOUS

PDF

76.3 KB Created: 2021-06-12 23:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 42cd8d49d8af22da71754309678da4c6 SHA-1: c97a28060ac72c17d081bb07e163095851a08fea SHA-256: 231a2404556b8ddbe42fb61228154a80c3223da800e865dcbc99993607011d11
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, and the document's content is likely a lure to encourage users to click these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://zajinet.ru/123?utm_term=periodic+table+worksheet+chemistry+if8766 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417980/normal_5ff0d39c35b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fd68db75fbaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_605d8ae42eeef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5ffd632c9ad2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_60b9ead33a6bf.pdfIn PDF document text
    • https://gabegolixen.weebly.com/uploads/1/3/4/3/134368455/0edc2e629d2.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/fufaret-dimesosabu-mopepuroke-nufojimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_60544c1fe7b47.pdfIn PDF document text
    • https://vutojexi.weebly.com/uploads/1/3/0/7/130776275/zakofisa_degodug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_6010f72319338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/435d8b44-c7c4-46ce-b6a6-200c386dc5ba/nikon_coolscan_5000_ed_scanner_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a994b2d6-80e1-4238-a178-5a51e2be7486/casio_wave_ceptor_watch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dbedad-5c7f-46a1-93ad-010466f51e0a/gefudiwegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7deae85-527e-4f31-a2fc-81a13a8f3567/98996868135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfe665c-5b94-4df8-a0df-9be32b5b9ed2/definicion_de_baricentro_en_matematicas_y_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8394fa-80f9-42a5-bf89-df014162ee6c/wesivinukigujonozuwuvepes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9206a54-08f9-4e1c-b43a-b22402a0cda3/how_to_make_bean_bags_for_corn_toss_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8c537b-c9c6-4a1a-a725-895ffbb2b538/walmart_cashier_training_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae12107-48de-48e5-ac69-17ba13af8488/91304014090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac88048-a023-42a2-8abd-104ff9e94aa7/72811906783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e5bbce-9adf-4f5c-b08b-b0444f1c723f/29188362983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad72ff8-09f0-4d71-8f23-49c6ecda7f7c/free_fillable_printable_family_tree_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1107e537-92ae-4562-9eec-38591822cb5f/how_can_i_update_my_lg_tv_software.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 6088 bytes
SHA-256: 0a5c02f3579474f6383f44cc400b82ba39d632c725b1eace85eb34ce3863077c
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 10392 bytes
SHA-256: fec36b119591a80f709e0b3fc73936be3ee24351d723f3b40adc809cc2f026fc