Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c0ae0bf90358db…

MALICIOUS

PDF

65.4 KB Created: 2021-04-01 19:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e05105a66fee5cb2dc1f9f9a9f8cf7e SHA-1: fbb6ba77054f68d3039181c810104a65d764c7ff SHA-256: 71c0ae0bf90358db931e99bac8c49c173962d16c51d3623dff23286c96a486b8
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8603

Heuristics 4

  • 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
  • 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://pelibifir.ru/award?keyword=anatomy+and+physiology+of+human+body+systems+pdf
    • https://cdn.sqhk.co/girewobo/KigfB0o/electronic_drum_set_price_olx.pdf
    • https://cdn.sqhk.co/wamamuli/Ujcgieh/eclub_olive_garden.pdf
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/1049163.pdf
    • https://cdn.sqhk.co/nujidegowupi/whdJhht/tobuwivutajozutiwetarafo.pdf
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/wivumupiw.pdf
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/webiboduzekeg-dokepugitibuku-pusit.pdf
    • http://gallery-shop.site/aws_data_warehouse_architecturero61y.pdf
    • http://moymagazin.xyz/rotutov23cqr.pdf
    • https://cdn.sqhk.co/gejupajo/rqmZUhe/74478863558.pdf
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/04513172edf62.pdf
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/d329d747310c19.pdf
    • https://cdn.sqhk.co/bivuwusim/hjhadYP/zedezijiwomajadifugibar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_0af1861b384542fe82fe89b8747f8292.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/59116599633.pdf
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_883b8c1b577f4a389f8bed34427387be.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_fdda20d5735a42cbb04a85ed19409c8d.pdf?index=true
    • https://s3.amazonaws.com/lewuli/what_does_partner_wod_mean.pdf
    • https://s3.amazonaws.com/nitirew/zenumafoguxijog.pdf
    • https://s3.amazonaws.com/kewakuko/natozo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbe.bin
05cf67b36bf6b6d057a66fed8bf351f7200b167292cd775dcef8d41c6bf2b02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 5472 bytes

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