Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d256e944066cd7…

MALICIOUS

PDF

79.9 KB Created: 2021-03-24 20:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d084369a41b052063b9335a9e2a8940 SHA-1: 2848b1c368f725195e997c363592a6b70224e1d2 SHA-256: 85d256e944066cd73180ec5179c264da62e75c5048c0ab17fcffc4d631be3b65
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF link farm', suggesting a malicious intent to redirect users to potentially harmful content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and a high ML score confirm the malicious nature. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=what+food+would+you+pair+with+rioja
    • https://cdn.sqhk.co/pesamelez/Qjaghii/62407958484.pdf
    • https://cdn.sqhk.co/vivutazawi/hehdGTg/movies_by_flixster_with_rotten_tomatoes.pdf
    • https://cdn.sqhk.co/bokupajokim/dggCjfv/fozijimufavado.pdf
    • http://plsale.pro/27642883486a6nwr.pdf
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/wavuzomera.pdf
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5ff1bd2ff322c.pdf
    • http://circus.market/lagotojawawobusasemxjy0r.pdf
    • https://cdn.sqhk.co/gepaxulunan/oYOd7Bh/user_guide_codeigniter_3_bahasa_indonesia.pdf
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/7e6f5de6.pdf
    • http://zubiki.top/9562834464877tty.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5ff4f2f9017f0.pdf
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fe3c147ed4f9.pdf
    • http://1ux.site/roku_tv_remote_app_for_android0ub5i.pdf
    • https://cdn.sqhk.co/migawudewiw/aAjfgeW/xebujewewowukubeteso.pdf
    • https://cdn.sqhk.co/fefowofuk/g6icjaK/69196980578.pdf
    • https://cdn.sqhk.co/mekaxosur/48N7iAK/58079466345.pdf
    • https://cdn.sqhk.co/mitapupafono/Pjf9hhV/real_detective_puppet_master.pdf
    • https://cdn.sqhk.co/noperizapewo/a5xxjgd/63243350642.pdf
    • https://rotizakaba.weebly.com/uploads/1/3/4/7/134766425/fedonudebut.pdf
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/3546312.pdf
    • http://shoplus.info/vivawudijelagudfp3un.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jefobexapulow/romewelin.pdf
    • https://s3.amazonaws.com/wazagidonux/labusetom.pdf
    • https://s3.amazonaws.com/gopuze/jejawimalos.pdf
    • https://s3.amazonaws.com/nawosineromigi/bitapunujukilejo.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_off0000f890.bin
a7f3fb171c3007beeec6ea91f84df3d3a5da37ca95d65697b60d759fe2a215ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 5236 bytes
font_01_sfnt_off00010a7d.bin
214ea627f18cb8e62232fcbf5ffaa043951647deb4b922077535b09b5e90ade6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 11508 bytes

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