Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc71d3ba48c365ee…

MALICIOUS

PDF

71.8 KB Created: 2021-03-07 21:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81c87c36e7273c4ad5ac704fd91d48cd SHA-1: 7bbc9e5c6bca1e741129680ee8693997fd5656a2 SHA-256: fc71d3ba48c365ee02aa160cdb0ff8e69c19d9e48d97e974f83372170639a00e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF's structure strongly suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=dot+plot+graph+in+word
    • http://xolokeminapi.getenjoyment.net/9957055408.pdf
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fd03b3fec842.pdf
    • http://sosiwawivijomo.scienceontheweb.net/nunutaporanidiz.pdf
    • https://vufaredagisab.weebly.com/uploads/1/3/4/5/134585575/1b545189e.pdf
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/fokawikaxerutowe.pdf
    • https://muropezevoride.weebly.com/uploads/1/3/4/5/134514904/taper.pdf
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/retape-duzimofewopujix-kabumawapokuzig-kelege.pdf
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/likozutowujeribisosa.pdf
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/radezofeluzozatisat.pdf
    • https://cdn-cms.f-static.net/uploads/4473031/normal_6045118bc321a.pdf
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/bd5ea.pdf
    • https://cdn-cms.f-static.net/uploads/4458161/normal_60317c92cbcc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://japinoxizidunub.myartsonline.com/is_cards_against_humanity_online.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_bd058ac3f5a54b2380a0511d8d1de2e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/672a0878-916e-46ea-9b8d-5d6b6c586264/nejavosatuludi.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_499b74ffc50d4b7697339d23c513d105.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5631f7b-f3b9-4a8e-8d9b-e900eb4ab60f/lokolawatapoxufevuxu.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_off0000db0e.bin
04709e9175c341aaf60f57553c2d9eb3ccfc507cc5db9100177b7b428696a5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 5136 bytes
font_01_sfnt_off0000ec93.bin
3f26deaacf871e121b91bb1cfd17a6d4114afecf347c2372b7c89ee150b6fa51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 10952 bytes

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