Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdc7b7be804442e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 13:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc56bc5a95c570ccf69947c4ab22772f SHA-1: 522d4ef24495daa3fea342485c8df152ab53fd47 SHA-256: bcdc7b7be804442e8b934cfdab4ca28d40322606915c9ae8a950d9f67440dd10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document is part of a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://tingchucontrol.com/Uploadfiles/files/19378638880.pdf
    • https://illustrations.noche.fr/images/files/18578393273.pdf
    • https://nomortiga.com/contents/files/83058628640.pdf
    • https://sanaspinler.net/calisma2/files/uploads/24013250990.pdf
    • http://cuacuongiare.vn/upload/files/pisuvogofigekebeku.pdf
    • http://cuacuonbinhduong.com/upload/files/mibevazixikofe.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/pajugokojetusesodubinegav.pdf
    • http://hnyinfeng.com/d/files/14674543676.pdf
    • http://vititanon.com/user_img/files/kukidujozekibadameniv.pdf
    • https://parisnordmedical.fr/docs/file/wikubezumolezafitesur.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/kagemitopokusoxululoki.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/16761408326.pdf
    • http://hai-bi.com/uploads/files/202109251909018409.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435d5f2098a---rixikexexelatefofagop.pdf
    • http://staceyasp.com/UserFiles/file/66651924216.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f83b0d3d0---sonimej.pdf
    • http://immopolignano.lu/images/95366381187.pdf
    • http://cuboni.com/uploadfile/hong202109051646395888.pdf
    • http://kleinschadenexperte.de/userfiles/file/46404048230.pdf
    • http://americansemitruckparts.com/d/files/fexuxatajalowirapijoril.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/72524446702.pdf
    • https://svingenieria.cl/userfiles/file/xadogipexigesuzasazojedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+store+byte+array+in+sqlite+database+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_off0000af91.bin
c87818de397fbd00607739047c7e01efe8912300da5ecf11a297759d02e799cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF91 16876 bytes
font_01_sfnt_off0000db3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 16792 bytes
font_02_sfnt_off0000f351.bin
7780d0d38b3aacdaad7ab317d842f6190ea5ed981e9aacb525846f27e50171c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10716 bytes

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