Malicious PDF — malware analysis report

Static analysis result for SHA-256 7140e5c27bd2e225…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 23:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 990ddc87f1b6369b904b265bf29ce9b4 SHA-1: 4a5bed76bf9a13a9ce59d9303184ea7b7a10343d SHA-256: 7140e5c27bd2e2258545838b2c4265d3acddafe3dc0bd9ab37d052678c1da5b1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, including one that impersonates a search result for 'ccna interview questions and answers pdf', suggesting a lure to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=ccna+interview+questions+and+answers+pdf
    • http://carmakers.cz/userfiles/files/toxosogebusapikejawi.pdf
    • http://greece-ex.com/images/blog/file/xatix.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/97310147862.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fumuzezokowosuvur.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/xetomebupudisusum.pdf
    • https://betenrealestate.com/sites/default/files/file/80413726041.pdf
    • http://linza-market.ru/upload/files/75067059580.pdf
    • http://feg.vn/uploads/files/widojudizisujef.pdf
    • http://niszczeniewaw.pl/userfiles/file/29471964884.pdf
    • http://wxmx.cn/upload/ckimg/files/202109120212575375.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/vimevapegakib.pdf
    • http://galerie45.com/userfiles/file/wokojezinopagajaki.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9106c0323189738eb39c2bcbd7396085/likarajunorezojizepeg.pdf
    • https://ghnservizi.com/file/8173582956.pdf
    • http://haustechnik-hagenauer.at/lobolixukobis.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/rekewerakefedumobeg.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/mawapaxixabolatulonukelo.pdf
    • http://uptownchantilly.com/uploads/files/65813624544.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/22650530370.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130121bed67f---mazimotofiku.pdf
    • http://ackerviewguesthouse.com/userfiles/file/liwonukijefekasolanipimej.pdf
    • http://capmar.eu/userfiles/file/garipa.pdf
    • http://ex2010.com/uploadfile/file/2021091109235373499.pdf
    • https://akemi.ro/hirek/file/gufupexofafezowuviliwovis.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_off0000dc08.bin
4c515ee3f5b145cd04ee650c6d2dbdf2df0c68282d38e585d16093646413e1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 17760 bytes
font_01_sfnt_off00010a28.bin
f84940453cc1d30549237e6568fb88030d6480c6fb2a940e8a66e81175b9ffb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10996 bytes
font_02_sfnt_off000123bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 16792 bytes

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