Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79c23b5a1efcddd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 17:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b4f95b0b24bac05440745c12a271208 SHA-1: bf6d30dcb2257cff04c290610aefc81066eaae54 SHA-256: a79c23b5a1efcddd26907343b97f65e45086aa6433dc622fe80375cf661a1207
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=miui+11+launcher+for+any+android
    • http://nutrizionisti.eu/public/thread/risorse/file/41189544645.pdf
    • http://somkuthyoptika.hu/editor_up/xusugalozanakopewo.pdf
    • http://odumakus.com/uploads/files/48042756607.pdf
    • https://zzhqhi.com/d/files/84600288485.pdf
    • http://www.thaitofu.com/image/upload/File/bogisedipatox.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/46011617714.pdf
    • http://bioaec.com/userfiles/files/28243956014.pdf
    • http://www.mustwalge.ee/data/content/files/97055707332.pdf
    • http://gyuco.com/uploadfile/files/20210911_000032.pdf
    • https://eklyps.net/images/file/75815985552.pdf
    • https://genegurumiraclehealer.com/userfiles/file/95667021803.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315c133a363---xuzexasu.pdf
    • http://pecsimutargygaleria.hu/files/file/womeduvawuvub.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/nofuwanuderamodi.pdf
    • http://truhlarstvisollner.cz/data/file/tamonetakud.pdf
    • http://ogcdc.org/uploads/ck_upload/files/10467589219.pdf
    • http://rebeccaosborne.com/uploads/kanotonosewasozojemab.pdf
    • http://icltindia.in/userfiles/file/54009395165.pdf
    • http://globomax.eu/userfiles/file/xesavojupukiva.pdf
    • https://shinko-tw.com/UserFiles/file/77037312650.pdf
    • http://sinoorchids.com/image/file/rutaba.pdf
    • http://sirindhorn.net/upload/File/16694638085.pdf
    • https://amursvoidom.ru/media/files/kojupemi.pdf
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/43486488002.pdf
    • http://artstudiodesign.it/userfiles/files/18019162058.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/zaxofikanuwakaxidimoxaj.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_off0000e14d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16792 bytes
font_01_sfnt_off0000f95f.bin
4ebbcf1aec46097dd2abce2989f21860f3fc101d6467856cdc521444bc2e4f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 17620 bytes
font_02_sfnt_off000126c8.bin
385c23b9cb000e365e25424f407a0e1d511640cc84dc97535baa5064663bef0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 10564 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.