Malicious PDF — malware analysis report

Static analysis result for SHA-256 1357a7a7f6f3984f…

MALICIOUS

PDF

77.7 KB Created: 2021-10-01 20:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a417d7e33f6aa1503bc85cfe538f298 SHA-1: bba3a17b93a7f82c75a21ecaed5caf48795fa13d SHA-256: 1357a7a7f6f3984f27169b7c8b3cffa318875f2088de75d2ef932860e6215c8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=choti+bangla+choti
    • http://mylodge-naoshima.com/images/blog/file/39106471028.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/18958706155.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/63254030873.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/jofekolefiwurorub.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16155ce7768e89---wemaxarugenewiruwer.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/78000236924.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/zozenimugedepesetolotob.pdf
    • https://derechosenred.org/aym_image/files/devajepisosolanomi.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/zuwasugorosudo.pdf
    • http://bischofs-scheune.de/userfiles/file/52485705925.pdf
    • https://ukmalayalamnews.com/userfiles/file/87745193490.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fb07f5585b5c367f3a061e93aea42da8/rekunolamusutotag.pdf
    • http://aldobini.it/userfiles/files/54183627096.pdf
    • http://fkjz.cn/upload/files/2021/09/202109261711459374.pdf
    • http://rc-mst.com/mst/_upload/files/85708264596.pdf
    • https://myclubowners.com/userfiles/files/17135467862.pdf
    • https://aljazeerahdrilling.com/userfiles/files/50998540855.pdf
    • http://refinerlink.com/userfiles/file/gujataladimotivitovag.pdf
    • http://lamelove-zakryti.cz/userfiles/file/jiguvisufoxodapelo.pdf
    • https://larrialdiak.es/files/galeria/files/23173369543.pdf
    • http://birizgardenhotel.com/userfiles/file/30467107292.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/votelukar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b206.bin
993d0a6f55c46c26e12feacf0450d59b9353b3a81a90e8ceb1a5b87c3e5bedbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 16152 bytes
font_01_sfnt_off0000c79a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 16792 bytes
font_02_sfnt_off0000dfb1.bin
5db1917ab4512fdaeb6627c3e2dcbbd8eee269010e1a2934b7c1b9ad18f3d6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 10280 bytes
font_03_sfnt_off0000f6c7.bin
c991a7b06666283c6559c0050ba8a45afd420fc74717f78ced1e4aac081a94ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 19600 bytes

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