Malicious PDF — malware analysis report

Static analysis result for SHA-256 393692285cb69686…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85f543163bfa61c29ae1b4f6199af8d1 SHA-1: 25981aaa9b3fc6a655d5e3b632dceb691aeab09f SHA-256: 393692285cb69686d17a19c075ca396a70959efa9cada89f077545cfbc8e0340
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://vuatoyen.com/uploads/userfiles/file/dojobesujiwepesizup.pdf
    • http://alnadaoil.com/userfiles/file/9165726518.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/kipegeruxed.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/14634752019.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h9g181suulf0oalfl973lvqdbs/15440986528.pdf
    • https://badanie-wody.pl/galeria/file/31127325841.pdf
    • http://lesen-und-schenken.de/userfiles/files/92479050970.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/pezikega.pdf
    • https://alkathirilaw.com/userfiles/files/41519406800.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9q228d64l6ds3ofi6em398m21/64265659096.pdf
    • http://jdjcnc.com/upfolder/e/files/20210912060927.pdf
    • http://usairsprings.com/userfiles/file/28771732016.pdf
    • http://garmaclima.com/uploads/ckfinder/files/jisivenik.pdf
    • https://hankilfood.com/upfile/files/darisuzufis.pdf
    • http://ecohouse-lab.de/userfiles/file/75285522284.pdf
    • https://iskoruma.com/upload/ckfinder/files/zolizenejelolig.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bimupoxotefusitukos.pdf
    • http://jdjcnc.com/upfolder/e/files/20210911162850.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=x+vpn+apk+android
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/gazaziloliwisazekodudupuf.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_off0000d9e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 16792 bytes
font_01_sfnt_off0000f1f9.bin
1a7ba43306f74f8c53882e8a321f3fab19f9e6d1bae7991616ff0c442cf8066d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 18540 bytes
font_02_sfnt_off00012218.bin
fb5e9b0062bcbdcb2a8676c2e8f15c16cb08040bbe96728b216daf631b4685fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 10108 bytes

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