Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6a5775c4431eb4…

MALICIOUS

PDF

79.0 KB Created: 2021-06-11 14:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93edd499b93bbc03cc2212a1feea434c SHA-1: 76af5ece1e1f11cbeb95a7f06f960b2ff77a194b SHA-256: 2a6a5775c4431eb4a42b78998802c25b1755f1a3bcad60f53057b7e1daed2437
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/pbw?utm_term=apaharan+web+series+720p+download
    • https://cdn-cms.f-static.net/uploads/4383801/normal_601d5b8c578e5.pdf
    • https://cdn-cms.f-static.net/uploads/4368495/normal_6069f8f0d017d.pdf
    • https://zosotise.weebly.com/uploads/1/3/5/3/135393527/kazopage.pdf
    • https://cdn-cms.f-static.net/uploads/4478961/normal_60c2163513ef1.pdf
    • https://cdn-cms.f-static.net/uploads/4389820/normal_601a81558a0e0.pdf
    • https://gepepokomireke.weebly.com/uploads/1/3/4/8/134892048/wetumofufetujip_dekejefase_zowij.pdf
    • https://static.s123-cdn-static.com/uploads/4445334/normal_5ffb3e0cc1e56.pdf
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc98592b843c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/080ef769-ffa8-4c0e-b834-a01cd533ec6e/62820309934.pdf
    • https://uploads.strikinglycdn.com/files/32b6151a-1b55-4a4b-ba88-ca23a50cf12e/how_to_draw_snowy_mountains_step_by_step.pdf
    • http://kolasotosexu.pbworks.com/f/descargar_capitulos_de_la_casa_de_mickey_mouse_en_espaol_latino_mega.pdf
    • http://bijinim.pbworks.com/w/file/fetch/144757062/yarg_yaynlar_2021_kpss_muhteem_matematik_tamam_zml_soru_bankas.pdf
    • https://uploads.strikinglycdn.com/files/c53f315c-9fe2-4c25-ae32-caa29a2717fe/1537655254.pdf
    • http://guleribiko.pbworks.com/f/beach_ball_icebreaker_questions_elementary_school.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144909201/22620298179.pdf
    • https://uploads.strikinglycdn.com/files/b7648759-2512-4c0d-b422-acd33debe14f/13996164628.pdf
    • http://tovovojufa.pbworks.com/f/conservation_of_energy_problems_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e923.bin
a4379a3e0d4444ddc49110540fd7d354073789153907a69c965065db40fb56be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 5624 bytes
font_01_sfnt_off0000fc52.bin
1b98c59271ffcc8d9b4c3c0d0698d8d1acced940f118e5208ebc74bdb8363b28
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 11764 bytes
font_02_sfnt_off00012324.bin
876d29f8c2286d5706550cb100a66e4497667bd70c26eef56271ad523dce8d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 2964 bytes