Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef3ebe416ed5c88…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 00:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8b94630888d507445af8145be2b3006 SHA-1: abbb4c86ec01bdf07428a78cccc61659ac797849 SHA-256: 9ef3ebe416ed5c88baa828de3c1ec34e2384d89acdde3610f902f2ebf8bb9c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, including one that appears to be a redirector for potentially malicious content. The PDF structure and the presence of external URIs suggest an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=xender+download+2020+download
    • http://ayrh.internet-match.com/upload/files/dijidowixu.pdf
    • http://premiumdrinks.eu/userfiles/16603288050.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/7586214470.pdf
    • https://tidurmalam2.com/contents/files/dilubo.pdf
    • https://windscrm.net/files/file/43460816348.pdf
    • http://gorod-r.com/userfiles/file/61696373507.pdf
    • http://birdwatching.sk/media/file/49930059418.pdf
    • http://designpavelzapletal.cz/files/file/85571394987.pdf
    • http://technoprofile.ru/userfiles/file/65009643642.pdf
    • http://denki-shonan.com/uploadsfile/tatoruwolebomonero.pdf
    • http://veewood.com/file_media/file_image/file/ravamipipuzomavom.pdf
    • http://skolky.info/foto/images/file/73391068648.pdf
    • https://mimpishio1.com/contents/files/94619209502.pdf
    • https://dichvuhappyhouse.com/upload/files/budoturenepimob.pdf
    • https://aecvfcom.nrgence.com/upload/userfiles/files/vibisekuzumonemuwu.pdf
    • http://guanzhuli.com/userfiles/file/zujug.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kuxosex.pdf
    • http://lungshingcentre.com/userfiles/penotigobe.pdf
    • http://savytrading.com/userfiles/file/govonogetomaxijamadodanir.pdf
    • http://enjoy.sk/editor_uploads/system/files/lavuk.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed62394e3---fivupakuwuluriduju.pdf
    • http://szpitalstrzelin.pl/userfiles/files/15547914496.pdf
    • https://efsanepin.com/calisma2/files/uploads/rasuzivasutikeperujitog.pdf
    • https://louvre.lv/res/wysiwyg/file/lipapigogexomumazejowu.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_off0000e5f3.bin
254d67477d7a84ad899d527bfdc8565d282666321ec54e833aaca90840a021c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 16992 bytes
font_01_sfnt_off00011211.bin
7619ba4f6584e595a968909ada77e9f901442808a383cd2728f9b5fa1dab9e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 10216 bytes
font_02_sfnt_off0001292f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes

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