Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0898bba8b9bf207…

MALICIOUS

PDF

69.1 KB Created: 2021-03-18 19:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac0b33c1f0ef0d062142a93f762e3577 SHA-1: d3dc44f2bf3c5776df38c2fcc53258dfd92411b2 SHA-256: e0898bba8b9bf2076e1432420e654790fd93f3b28002cd743234241508409df8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://botokaw.ru/wix?keyword=a320+study+guide+free
    • https://cdn.sqhk.co/jaxubefe/r6hflw7/tuwipugafeduremefolarude.pdf
    • https://static.s123-cdn-static.com/uploads/4489730/normal_5ff9101be3ec2.pdf
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc7391712691.pdf
    • https://cdn.sqhk.co/medukukekuke/hdjihbG/66723214952.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_602c64d846f49.pdf
    • https://cdn.sqhk.co/durotula/8GVL6dh/ballet_classes_near_me_for_13_year_olds.pdf
    • https://cdn-cms.f-static.net/uploads/4390055/normal_602188f3602ef.pdf
    • http://kakolamilasaru.medianewsonline.com/fakoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2c2d488-8e6a-4b41-a52e-86b6657001fb/directv_genie_remote_tv_codes.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_6deec9903e034363b13d794985146e40.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cfb2f3fa-b249-4698-92d6-343e438be624/bank_5_fairhaven_hours.pdf
    • http://wumafopid.onlinewebshop.net/zawiwugomujeguvoz.pdf
    • https://uploads.strikinglycdn.com/files/7a7e9040-2cdc-402f-9c2b-12f740f6e117/62420030078.pdf
    • https://uploads.strikinglycdn.com/files/c4888882-4b92-4ab4-b0b6-821af58d87ac/zisuzeloxobepevovefadexo.pdf
    • https://uploads.strikinglycdn.com/files/34147b57-c452-4e48-b83d-c76228fb6ea1/windows_7_sleep_command_not_working.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_60ba9873ba454a9f9133bb02ad51acd4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5f9b65c-bf72-4f0e-b458-8dd173ea456c/elgato_hd60s_setup_obs.pdf
    • https://uploads.strikinglycdn.com/files/22674e24-ee6b-4f47-9ded-4ecaa2e2425f/liraralobubogupizux.pdf
    • https://uploads.strikinglycdn.com/files/6bf9699a-9253-48e5-8a71-a76c04587c91/supply_chain_management_entry_level_jobs_toronto.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_dcdecc5b30fe49c1a79ab99d2f094cc4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee33f51f-9126-477b-b432-b9eb1561eb80/20620505810.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ce.bin
593aaeebaf8a6a87351ec192857095e7c84ba48c9c3b5a0948c1f486647f32ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 5360 bytes
font_01_sfnt_off0000e331.bin
55287035a9c8a2d94c5223b6f288c2036d1cbbc799288266b0c41387fb577bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10440 bytes

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