Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f33ab771a5fbfb1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 08:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20ea2a5d87a7ea480f9bfdf31f0b5c20 SHA-1: 6df9a09500a2b5654b783840e262dfa5b39b4d00 SHA-256: 1f33ab771a5fbfb140e865c97f8abe47ae0ff063ee782297e29ca85ec7cb8b6f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to distribute malicious content. The embedded JavaScript likely facilitates the execution of further malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=email+template+for+submitting+resume
    • https://tvmreza.tv/ckfinder/userfiles/files/30617058360.pdf
    • https://aaaxxion.info/images/file/parotowet.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/powosipuxejaloven.pdf
    • https://g-mtcc.com/motakamel/Ups/files/67889474886.pdf
    • https://tekartltd.com/upload/files/12870904893.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/37608803856.pdf
    • http://polyacer-ecp.com/userfiles/files/20210917_082556.pdf
    • http://cachnhietcacham.vn/Images_upload/files/4913834515.pdf
    • http://maybaobidinhdinh.com/upload/files/25686383959.pdf
    • http://tpt.taipei/asset/uploads/files/vobujod.pdf
    • http://ryukatsu.com/userData/board/file/kusojawitulejave.pdf
    • https://trisyscom.com/userfiles/file/97908697072.pdf
    • http://yuh-tarng.com/userfiles/file/90321224171.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434eabbbec4---soduzo.pdf
    • https://vcubusinesssolutions.com/userfiles/file/88445944260.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/lazunejawasenojezosotox.pdf
    • http://poliinc.com/upload/files/687534328.pdf
    • http://jandebruijn.com/uploadimages/files/47398644150.pdf
    • https://zegaoyun.com/calisma2/files/uploads/75287493481.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36593539937.pdf
    • http://resetimpianti.it/reset/public/file/81156320453.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/66681699941.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_off0000d7e6.bin
fd8d9f2891b3200d784441afe8fbbd9a7e7ba8abe4100e1f27f472d4c4d5cbf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10924 bytes
font_01_sfnt_off0000f0f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
font_02_sfnt_off00010902.bin
f2af10505797d35b3db4a0fe7234ee92df3d1b4929e77ab3e363cee2911d5c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 17388 bytes

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