Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4fedc5236b049d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-11 23:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b25b1b489b3b3a3aa5d12eb8e51644b SHA-1: 1022f694e325824e6133128ed0d8d579d0c2754c SHA-256: 2b4fedc5236b049d8e6e38d668b3afd769137851262acad088101856e07ae4b4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=excel+vba+application.+worksheetfunction.+transpose PDF link annotation
    • http://lamakexo.scienceontheweb.net/leduximibosimibatajiwewo.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/Qs9hejj/21019920509.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/7daecdbf375dcee.pdfIn PDF document text
    • https://xefobizedep.weebly.com/uploads/1/3/1/6/131636625/sumen-telutig-bebaji.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/60864122599.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/aigdQhi/ballroom_dancing_silhouette_gif.pdfIn PDF document text
    • https://vutojexi.weebly.com/uploads/1/3/0/7/130776275/zoteme.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/ajgd6kv/64708224420.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ieTNEje/74993706703.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/bXKCgip/gajaperomixisosizuboji.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/dc2e3802-44d8-4f96-acc9-cd9b965da6bc/pusoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9fb66a-7674-49c7-91ab-e6c04118ab19/nextbook_ares_8_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6948d4a-119a-4ee8-9c85-fa4d12d082de/1504550501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aef087-d285-477b-8c30-3b0c198fab9d/frame_analysis_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd9bc58-f36f-4fda-8204-ca9e847f0e0a/a_supposedly_fun_thing_ill_never_do_again_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139b094a-9bf9-4879-bfe5-38b154225389/vampire_diaries_season_10_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cb3c8b-b94e-4006-8956-37d6cbdfff17/86686986568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b33b1c-1426-40f9-ad92-8363007f871d/ruxozubene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b545202e-f3fc-49fc-927c-95c9db2cd461/does_cricut_expression_still_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7e8731-196e-487f-bd0f-d94766de0b6c/nizanizedovanijeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78c2eea-1c99-4f83-bba9-f621fd52aa93/jeniki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bd1a87-0fb3-4fa3-be70-b7a5f3b16092/the_power_of_less_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67e1f39-c916-476a-94c7-e902b560bb2a/61323555559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284407d8-b22b-40b2-9fbb-2d0fd108ac8c/how_to_clean_wolf_oven_top.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_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5516 bytes
SHA-256: 1dcbc973ae5840421f325538739f872c4bd0ab15246347cc1ed48cc9ab4e8263
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10740 bytes
SHA-256: e3abb2c373368013af7ccd2adb6f6c613e0f319fd9aa63a57cfe4c2dd2d441bc