Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f862c336a5a3234…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 07:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b5d13df798fb6383abb86af07edef76 SHA-1: 13d05e5e6c18051192d1722fb8c70a105695576f SHA-256: 2f862c336a5a3234cbda36487928c1d4cac0acea06698474c51948ba302fde2c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of further payloads or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=dude+simulator+3+download+android
    • https://sarenpinler.com/calisma2/files/uploads/ruzelukisegilef.pdf
    • https://cottingham-group.com/cufiles/files/libarisufumudo.pdf
    • https://kamarkosong.com/contents/files/talofawatumuzox.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/rujoxuxumobopemibugewuze.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614467145f2fe---95400824426.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/rozilepej.pdf
    • http://www.frank-diagn.hu/userfiles/files/17915121296.pdf
    • https://badrivishal.com/media/nekepivakeniwidu.pdf
    • https://whatproperty.ng/ckfinder/userfiles/files/kexuxexufugivonepumowu.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/bakoxadefatifumuzavirepil.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/23133951874.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/51873452047.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/70621153063.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0586a75c1---86317080177.pdf
    • https://solener.info/ckfinder/userfiles/files/81186312699.pdf
    • https://callmarkinvestments.com/callmark/files/womiduvof.pdf
    • http://saigonford3s.com/uploads/2021-09-01/images/files/19408998719.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/35875355308.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/88275851435.pdf
    • https://noithatkuongthinh.com/uploads/files/79300225557.pdf
    • http://lamardaegu.com/upfile/user/file/38891114987.pdf
    • https://nyig.com/files/file/41413805708.pdf
    • http://mxagproducts.com/upload/browse/file/wosupodirezixogeve.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_off0000cd31.bin
ab2fb2fea6867369965c1b9d2eea06332b549b5f4260d00090107344fa4f04cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 16640 bytes
font_01_sfnt_off0000f846.bin
cfa15ebf5f91ccd7cbf52f4463c4b12b319b4bdfe8c9cf3fa4a7a85584a305b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10768 bytes
font_02_sfnt_off00011121.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 16792 bytes

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