Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edf0f5087a1d61e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 23:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81591be5494d367b62d894dd496d9338 SHA-1: abce731c1ffdc875974320c0735514365d897c88 SHA-256: 7edf0f5087a1d61e4f31f3886d201b7d7cbac333e166a40db3425150071b3d14
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://acavacecio.it/userfiles/files/wixuve.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1663c3aa1843d6351b6464158adcf3cc/sewusisuz.pdf
    • http://dep14kirov.ru/userfiles/file/newujemifezilafelekil.pdf
    • https://namphuctourist.com/userfiles/file/kixamurapego.pdf
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/92972693033.pdf
    • https://associazionedynamica.it/uploads/file/nededefajexel.pdf
    • https://daiichitravel.com/uploads/news_file/xurogupedowoget.pdf
    • https://jensbrode.de/files/file/fekerobixur.pdf
    • http://greenflameenergy.com/userfiles/file/5737338375.pdf
    • http://shinhwajudan.com/userData/board/file/xufixubavajagupas.pdf
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/59140745764.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/zuparov.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/83184059480.pdf
    • http://webbuilders.com/files/file/zinilusipuxekerotazuk.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/buwaxe.pdf
    • http://holidayservicemarsala.it/userfiles/files/lapimawidoxenir.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/wimovaxorejewage.pdf
    • http://twtipa.com/upfile/files/2021/09/17/77749770657.pdf
    • https://solidpractise.com/files/userfiles/file/bilefilanozowe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+unlock+a+disabled+iphone+xr
    • 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_off0000d375.bin
dc74e188488d205edcf36be5e76decf92e6b9d1fa3796548474159cc1397b45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 19680 bytes
font_01_sfnt_off0001068e.bin
61febd92fb2ed1e7ea82df16441a8335a403f8d05e269452f9369f27afdf7ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 11120 bytes
font_02_sfnt_off00012048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes

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