Malicious PDF — malware analysis report

Static analysis result for SHA-256 660174731b8ca2a1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 02:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c72e0ec7e7cb7c364d15ff7046ce2b7c SHA-1: 09bb693db9aa0c68f8199db3816d515faf7d5573 SHA-256: 660174731b8ca2a1d14776eac17d9cda36961a09a8a5ad148aa3330fbc3150a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which host PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm malicious intent. The presence of a URL with 'client minecraft hack' in the UTM term suggests a lure to attract users interested in such topics, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dailyhondaotomientay.com/upload/files/nogolujitidojewawuf.pdf
    • http://tetraeng.it/userfiles/files/10784284054.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/dodafapivotepa.pdf
    • https://makenie.com/upload/files/tazufali.pdf
    • https://cultureresortpokhara.com/assets/userfiles/files/nagakivunudunuwoj.pdf
    • http://vizugy.hu/uploads/files/50323602347.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3e3546f8---79556542996.pdf
    • https://mashura.co/userfiles/files/wozexugabi.pdf
    • http://galaxyjewel.cn/uploadfile/files/bonugav.pdf
    • http://fecirturizm.com/resimler/files/95687547281.pdf
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/luduxirenimiduwikoxiziwix.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/78560869388.pdf
    • http://2990592.ru/ckfinder/userfiles/files/15941195384.pdf
    • http://ediljolli.com/userfiles/files/vesaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=client+minecraft+hack
    • https://mediaget.com/userfiles/files/zekanijosun.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 16792 bytes
font_01_sfnt_off0000f2d9.bin
a6937373bedaa9bec04816c8c558321d970e393f47dd7665abb742a03d8ed8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10436 bytes
font_02_sfnt_off00010a3e.bin
9f8d943f9a5aaddc3587700730754d0f68b17523f48684021de031b47371c4ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 18160 bytes

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