Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd99d0f8a3c7c8c…

MALICIOUS

PDF

78.3 KB Created: 2021-05-29 14:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 779df97edc95f57d5bc0e5aa6e0a2fa0 SHA-1: e04e5372b161061bdd46498965f573306940566a SHA-256: 4dd99d0f8a3c7c8c7ddd3f0f7db67cbe449f35a5b1e42f5bc42ceb8b56a7ff8b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The embedded URLs likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=sequin+flower+girl+dress+with+bow
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/8ae6f2a43d497.pdf
    • https://cdn-cms.f-static.net/uploads/4453740/normal_60254fb4b04d3.pdf
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/pisaguwosakuvok_kapepalopefun_vimar_pukajidujew.pdf
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/5027681.pdf
    • https://kizubunutasi.weebly.com/uploads/1/3/5/3/135348794/cba1cee9890dbd.pdf
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fcb58f922790.pdf
    • https://maminimavuzi.weebly.com/uploads/1/3/4/6/134640728/db43b73d.pdf
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/kapowepuju-tetagira-muvelemari.pdf
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/609307.pdf
    • https://dunulukega.weebly.com/uploads/1/3/4/4/134442930/2ae46fd6d59.pdf
    • https://debosuvulodek.weebly.com/uploads/1/3/1/0/131071041/zirogiw_miliwit.pdf
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/e3e554.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b80d791a-585b-4810-8689-b4a4a7c7d19d/major_themes_in_wuthering_heights.pdf
    • https://uploads.strikinglycdn.com/files/ca64a31a-11a1-413c-aac1-9bd25af84185/dmonter_garniture_porte_306.pdf
    • https://uploads.strikinglycdn.com/files/a1fe95e0-a1e5-4b85-81c8-8ec5985d8882/37768132908.pdf
    • https://uploads.strikinglycdn.com/files/f50b35c3-2bc1-4e2f-8c70-c05ed1f77a8d/can_cop_cars_be_unmarked.pdf
    • https://uploads.strikinglycdn.com/files/e0cbed7b-0cea-4a9b-b98e-9d3c119d84f7/how_to_change_a_washing_machine_drum_bearing.pdf
    • https://uploads.strikinglycdn.com/files/c8732368-c099-47cf-866e-4e87bb7b27fc/88545421227.pdf
    • https://uploads.strikinglycdn.com/files/24cd95a3-83f8-450c-865f-de73047f669a/garobusoxajadapowos.pdf
    • https://uploads.strikinglycdn.com/files/7bc36f45-9c8d-48a2-8651-de12a614af10/how_to_get_gta_rp_on_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a0.bin
b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 6588 bytes
font_01_sfnt_off0000e91a.bin
189de665f52a163c7f8c6283e0634861d867adad6c1ed8fc0c38b391d115d0d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 5420 bytes
font_02_sfnt_off0000fb84.bin
74b0f7db8d521f0ba138b1f7682b8c56bc480b077482435ba61c3944a6315d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 2212 bytes
font_03_sfnt_off0001059e.bin
ca4f2270cf70f57eae7e92f6e6197fb20679939b150a3d9976153fa06d6bffb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 11088 bytes

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