Malicious PDF — malware analysis report

Static analysis result for SHA-256 415250ee1634fd50…

MALICIOUS

PDF

74.1 KB Created: 2021-06-12 13:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fd0c1a6a3fe0b7948f221982bbc18d70 SHA-1: b8afec4e1196f2d6c5f4cbda75c88dd22539d8dc SHA-256: 415250ee1634fd50fb78e3ba1c022eb8750e9e09fd61d56a991444e5575c980a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unrelated PDF documents, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/123?utm_term=pencil+shading+worksheets+pdf PDF link annotation
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/gizud-sadazev-mufekagaripanug-vuloke.pdfIn PDF document text
    • https://patajarixeli.weebly.com/uploads/1/3/1/0/131070073/warawor_falekigiraro_binazarov_wujawozoxato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_6014212d4d0b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5ff5f95e04b99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5ff269596a2bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5ff4ac0ccbae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_6065d459dc609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501204/normal_6004a462bd7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_6057ccdcd517f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5ff545138bb7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_60bec8fc21f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fd68c06b5273.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/9a8f6d16-22a3-4e27-b0ff-11e61e8d2d6d/how_big_is_30_x_60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6cb6ba-443d-451d-99d1-988313116b99/how_to_turn_off_dish_hopper_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120ae36d-fb8b-4b11-9720-3565a9dd012f/data_mining_practical_machine_learning_tools_and_techniques_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26edc5b5-f599-4b22-8f80-d79a2f1bea7e/kepogijukizora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c512571-1f67-4d9e-ab4b-4e4de914a554/vusawezumudexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9f8077-e2f6-48bc-8897-a607d97624f9/sap_inbound_delivery_type_determination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a83f73-b104-4f7d-8f95-0d71eec3a631/a_histria_do_brasil_para_quem_tem_pressa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a675b31c-2148-41fd-a045-e39ed2d5c546/tidiwabuxejojuwoted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7535d72-e757-4a7c-8329-28c4735e58b8/jejotalajutojotajapobomun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db56913-e931-4688-a3c8-9616a96cf4ca/76865888015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c4feba-3728-4720-8a1f-dbe355b0488e/chrysler_town_and_country_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342e55d7-6fef-4b8d-85ee-90f2ecc98ba0/venn_diagrams_worksheet_ks3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d984caaa-04d2-4ac1-9c52-dc0019213d04/bi_tp_trc_nghim_ting_anh_lp_7.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_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 5576 bytes
SHA-256: 0ad6893db56d5e1062fa80251d76e1a01baf7b66bce88c6330ea4a0b9b1118eb
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 11144 bytes
SHA-256: 6f47b4139e172e052c6fce3eed7e3f545b633345d35fbf366f35828af7b56087