Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9d1c5aedc09c9d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-17 11:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75b1c3d05a8c5aa589a57823925e0ba1 SHA-1: 89d5c6eb2dcfc2eda6c9284c2eedc8b2ec787b07 SHA-256: ed9d1c5aedc09c9d5f1b88d7a2757f513beb18fc541813f704ff2106219a351f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, functioning as a link farm hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The PDF's structure and the presence of many external links suggest it is designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=how+to+listen+to+music+from+sd+card+on+android PDF link annotation
    • http://wadirumshootingstars.com/userfiles/file///65535636304.pdfIn PDF document text
    • https://e-room.co/userfiles/file/rulefolaxarisabupo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ae1ce6c8---mavexozemono.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/vafebizeveruwenet.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/78430481471.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1073520359613caf21a9281.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630884954.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/82372934597.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/86817889272.pdfIn PDF document text
    • http://hangquangauto.com/files/88866912113.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xopelubozado.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/66687469967.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/v3b7otk8em19id9iosve4e88i6/jaganetudegawanukaru.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/93636450788.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/36982250529.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/26447943470.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/jonumuw.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mofive.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091705541513.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/guzedevafowawazamebukon.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/61045610632.pdfIn PDF document text
    • https://micsys.in/userfiles/file/wibodajajodaloxofonemuna.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001310c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1310C 18452 bytes
SHA-256: 81797db902296ab92f6cd2b4f62ddb162b5ea799a3d2f1b46fc0acbd2312010c
font_00_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 17244 bytes
SHA-256: 360d768ac6bd8a77249f0aaab0d50a7515a05493c3c1fa841a705938a4617ca9
font_03_sfnt_off00014e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E68 10816 bytes
SHA-256: b9bc9fbba443455522ef708bb902595d1867d8c97c95241a94d892ca53256d7f

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