Malicious PDF — malware analysis report

Static analysis result for SHA-256 977d8472e30a7c7b…

MALICIOUS

PDF

70.3 KB Created: 2021-05-30 04:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c0d4578eb4d6b717f25df96895ec8f5 SHA-1: 5be9a4bd0bf80becf467b3e72067fbcda41fcb8e SHA-256: 977d8472e30a7c7b1f0aa43b7790acd34b9f5189aa78431fd23a8ee8f8d5a98d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The primary malicious URL identified is https://fokemale.ru/123?utm_term=here+comes+the+sun+karaoke, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fokemale.ru/123?utm_term=here+comes+the+sun+karaoke
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/916b8980.pdf
    • https://cdn-cms.f-static.net/uploads/4503050/normal_605b521ecf643.pdf
    • https://static.s123-cdn-static.com/uploads/4427514/normal_6007ff19c98e6.pdf
    • https://diforugagok.weebly.com/uploads/1/3/2/7/132741100/jabatizulix.pdf
    • https://cdn-cms.f-static.net/uploads/4409107/normal_604cc0d98cf90.pdf
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/86325.pdf
    • https://static.s123-cdn-static.com/uploads/4481847/normal_60013cad33639.pdf
    • https://static.s123-cdn-static.com/uploads/4402951/normal_60065e8109178.pdf
    • https://cdn-cms.f-static.net/uploads/4372980/normal_603343c021a9f.pdf
    • https://cdn-cms.f-static.net/uploads/4393359/normal_60151f98af4e9.pdf
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/ab14feff3510ae.pdf
    • https://cdn-cms.f-static.net/uploads/4493873/normal_603509fa21916.pdf
    • https://xobijetulotifo.weebly.com/uploads/1/3/4/2/134234675/29194089.pdf
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/labozoji.pdf
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fef71a0f0904.pdf
    • https://xodalolekuxol.weebly.com/uploads/1/3/4/1/134108590/1005798.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f804039a-0402-4a66-b81e-3ba1da761808/guruf.pdf
    • https://uploads.strikinglycdn.com/files/a9c40874-17a1-42be-9396-b6dcd9c42c99/longman_offline_dictionary_for_android_free_download.pdf
    • https://uploads.strikinglycdn.com/files/96d82a6a-903c-48f2-a0ae-d92228190193/toro_weed_eater_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/600d9922-e38f-4c0d-9987-2fb9dc6ce49d/hp_officejet_j4580_all-in-one_printer_manual.pdf
    • https://uploads.strikinglycdn.com/files/6afbe9a4-343d-4c80-807b-a8baa7358638/unicorn_cx2100_electronic_dartboard_instructions.pdf
    • https://uploads.strikinglycdn.com/files/051a04a1-b321-4a6a-8c5e-1169cf3b5f54/solar_system_gizmo_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/6b683d66-6a2c-4100-9913-b00037840fbc/fundamentos_del_marketing_digital_google_respuestas.pdf
    • https://uploads.strikinglycdn.com/files/d84edf01-48f3-4c35-8786-2058e861089b/forufezuzedi.pdf
    • https://uploads.strikinglycdn.com/files/73d67c8c-d5c4-4f41-b745-caf0c514bc3e/teenage_mutant_ninja_turtles_movie_download_in_hindi_480p_filmymeet.pdf
    • https://uploads.strikinglycdn.com/files/7ea00492-4b63-44d5-8bf0-46e9edb86753/malekij.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_off0000d65e.bin
d80eed633bad0ee3eaedf5bbcf8a17a5dc1a8fbf1fb4eb213bbefb98c449d6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 5032 bytes
font_01_sfnt_off0000e74b.bin
d160f3d4c03a1fb2ca7cfae2b440b06013a689d95544cb7e82ce46c06d45606f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 10724 bytes

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