Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11c3f62c867215c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-12 06:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a727fd845231a8c9bdae63db85c0d97 SHA-1: 55766514c27bc04b1970dcf98434a4e14925ae8d SHA-256: c11c3f62c867215c9cd6d227a5bd0d421e86fa543686c6f72ddda9d57a729297
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are generated SEO-style links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=ge+profile+microwave+convection+oven+manual
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6017b28a426a2.pdf
    • https://cdn.sqhk.co/nazutupim/ieKhbt6/whatsapp_video_status_download_sad_punjabi.pdf
    • https://cdn.sqhk.co/rurewemanavi/hatifvO/70171212579.pdf
    • https://cdn.sqhk.co/zoxemetakol/8heJtjg/alien_apocalypse_full_movie.pdf
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6013c1e077cc8.pdf
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5ff22f2a0b98c.pdf
    • https://cdn.sqhk.co/sizafutito/jiishdp/dinosaur_hunter_3d_game_online.pdf
    • https://cdn.sqhk.co/vagizabibo/jhiaidz/knight_solitaire_2.pdf
    • https://cdn.sqhk.co/sewuvavimebi/ciiQc0H/kuzusemaz.pdf
    • https://cdn.sqhk.co/tumosirewuw/5qhhfxq/17700024015.pdf
    • https://cdn-cms.f-static.net/uploads/4453889/normal_60174aca9fbf8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2dbeeaad-831a-41eb-baa2-717aa1e6f2a9/best_video_settings_for_gopro_hero_3_plus_silver.pdf
    • https://uploads.strikinglycdn.com/files/e44db52b-3baf-466f-b4d2-5c9dc7d6f380/simple_steps_to_draw_anime_characters.pdf
    • https://uploads.strikinglycdn.com/files/a5784648-bd6f-4461-bf83-43d0b0aed108/xexozugeviwof.pdf
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_c7a3448821ae404b92375988e7be5957.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_ae55d9848fac41cfb56c5fb4ff29f1e9.pdf?index=true
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_84741089176b46e2af9041789e9f1339.pdf?index=true
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_9a6bb1c843624a40bd9818d47b45e3fa.pdf?index=true
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_89a70e7906f04bb8a268ce9991e7d23f.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_335d1170ba4b47e18b72c76abf6b4160.pdf?index=true
    • 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_off0000e800.bin
82f79e7249646a425f07808604260d4aec4d9de63d467d80ff331817f60e9f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5164 bytes
font_01_sfnt_off0000f999.bin
ea0f659835070988922ef95904b75e18d0adb40afc2b1149216429c766a43ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 10656 bytes

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