Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9144c82ff285c9…

MALICIOUS

PDF

93.2 KB Created: 2021-09-16 20:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09e2dd0c87b1e7d51f6f12ad229a1f03 SHA-1: 64cd43908d879324e1529dbe90ec4323563964ec SHA-256: 8d9144c82ff285c997facc3f7a6c773840c30476e7200dd1f639c30660e8bcf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=miui+12+android+version
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/vogexinutomopalokusi.pdf
    • http://soluzionebenessere.eu/userfiles/files/2192861470.pdf
    • https://tidurmalam2.com/contents/files/20873560889.pdf
    • http://sportingfoundation.com/uploads/file/85715882719.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/91993944119.pdf
    • http://sujitonweb.com/userfiles/files/bodavevewur.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50cc6cb21---welise.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/xuximirorevirepem.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/polezopujevedog.pdf
    • http://goodwill.as/userfiles/file/loreruwa.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/tolevitamagesuna.pdf
    • http://hongdanhaudio.com/luutru/files/71380186227.pdf
    • https://marathonblainville.com/userfiles/files/28746594102.pdf
    • http://thegioidahoacuong.com/uploads/image/files/milizuvivunadet.pdf
    • http://warmistore.com/userfiles/file/dijenerugove.pdf
    • http://back2wood.de/userfiles/file/somobake.pdf
    • http://mayphatdienngocquang.com/media/ftp/file/wogewovifobokixijabad.pdf
    • https://www.karelo.com/uploads/File/lepuj.pdf
    • http://albertopizzetti.it/userfiles/files/47286168111.pdf
    • http://santamariamikado.com/uploads/files/92895890007.pdf
    • https://parlagame.com/calisma2/files/uploads/15024823648.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/46604181788.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_off0000faae.bin
cad0728e0ec52b308900c3749aaf9f23d518f6ad8390a2fa54ddb7da6d3a47bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 10428 bytes
font_01_sfnt_off0001127d.bin
6bd99031daea30b6632bbe721b3d8857ba49eea00d664a2da0e0b1c3fe9be147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 23280 bytes
font_02_sfnt_off00014f52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F52 16792 bytes

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