Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e917c5716a2e78c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-28 15:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a022a425d938a424b623353226c784a4 SHA-1: c7c05ce925d7d0916973ce173e04d1fc2f0b7205 SHA-256: 5e917c5716a2e78c2990dfcf126220fbfec87989ca12d501f2504b4a310ee0ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, hosting numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://detectagsafety.com/ckfinder/userfiles/files/6009959227.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/wiwuraxegup.pdf
    • http://architettoannalisatinelli.it/userfiles/files/66486224108.pdf
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/fifexovibo.pdf
    • http://abwrva.com/uploads/files/71327326840.pdf
    • http://frigotechreina.com/userfiles/files/sofuxuwukanopuj.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/39227552234.pdf
    • https://pacpartner.net/images_client/imagesfile/96543716027.pdf
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/61893321159.pdf
    • http://smogy.ru/files/files/wanaremefujuvenaki.pdf
    • https://nslogisticservice.com/userfiles/files/bunepuxitogabazadikonux.pdf
    • http://uceng.net/_UploadFile/Images/file/fizugekebijolafesifik.pdf
    • http://skisun.it/userfiles/files/betamefatonev.pdf
    • http://kursadowicz.pl/Upload/file/18447780270.pdf
    • https://kiptep.ru/file/27215381960.pdf
    • http://songpinhao.com/userfiles/files/tugevul.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4aa8dc3d2e5864b533a0390ab618e0b9/2455741521.pdf
    • http://1855-4080.com/userfiles/file/62525351194.pdf
    • https://istanajpdua.com/contents/files/47455225852.pdf
    • http://mylivediamondinventory.com/uploads/files/52963131965.pdf
    • https://borgopitti.it/userfiles/file/2594968011.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/80075091895.pdf
    • http://backupcenters.com/userfiles/file/tiruri.pdf
    • http://albergocavour.com/userfiles/files/wadodijotubu.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/14064669726.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=aplicativo+gerenciador+de+arquivos+android
    • 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_off0000bf8c.bin
1847ef6fd6384c1b3f0523b3491381365bb9e0fb68654ece9053da4cae443276		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 18640 bytes
font_01_sfnt_off0000effd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
font_02_sfnt_off00010814.bin
f964c0751820183f661334e7a68924c62c73eb7c48015d9f94c346ac520e0498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 10980 bytes

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