Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a42ee6337ae11…

MALICIOUS

PDF

73.6 KB Created: 2021-03-24 19:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 67dbb7036494775bdac41c73e60b451d SHA-1: 24abf26522a2dbd5b58fba08d88d707941c126b7 SHA-256: e49a42ee6337ae11669968d28e3fedb81fd4a69096a86184c246870421a9b707
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'vocabulary word list pdf'. The presence of numerous links, many on disposable hosting, indicates a link farm or phishing attempt designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://bologen.ru/award?keyword=vocabulary+word+list+pdf PDF link annotation
    • https://cdn.sqhk.co/xawowatu/Phahgmj/color_palette_from_image_url.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/klvjjaM/redibix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_603c442940292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5ff16c0c3caf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5ff718533f16b.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/2JW3dsk/ravuzuxirokobipupesij.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/currently_no_logon_servers_available_to_service_the_logon_request_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/gfsigjg/zitoxidor.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/jdjiiii/kujuvagudom.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/gehhhjk/novixuxuvikolubure.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/34618860167.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/4jejcgc/ces_2019_tech_trends.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_6057a7996180e.pdfIn PDF document text
    • https://cdn.sqhk.co/joxejetupafi/TiaKS5j/real_followers_apk_2020.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/hdfc_life_blue_chip_fund.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/4165547d-e81b-48e9-b392-3af4858c0927/16830737838.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/bonezobakotisasew.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/3595310008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70126d1-b138-4f28-88cd-99a86edbaf51/flatten_3d_autocad_drawing_to_2d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4396cd3c-6702-4883-810a-51c7c0df1018/what_is_a_computer_server_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f651b089-4b4e-43e8-8bea-f44cbef45e6d/ragamagek.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/88154569848.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/ledaxibuwepajezilaporoza.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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 5448 bytes
SHA-256: 8627c33e801ac307cc43ce9e8653e787fbe35ae40826d367a42ce7f9eeac8389
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10236 bytes
SHA-256: c4ddd8cb333800780ccc936ed52f5cf765fc3164cfb998521023150f0dff2278