Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f19cf9befa0689…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 08:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2afb9a6261360ebd15d3d3ee6ef5be8 SHA-1: e3cb11006fbe17ef4635db92469fb378b2dd084b SHA-256: 85f19cf9befa068963e7edc22f619c9560cc3d1cbe66893d7c244f6b1c636281
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are structured as link farms, suggesting a phishing or scam attempt to direct users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score further support this assessment. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection by ClamAV as 'Pdf.Phishing.Trojan' indicate a malicious intent to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://thietbiantoanttk.com/uploads/files/gikukexosix.pdf In PDF document text
    • http://www.gobarging.com/uploads/textareas/file/nidijafetijatubexugowek.pdfIn PDF document text
    • https://angkagenap.com/contents/files/65576056166.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/fazogafijipulijovaxemil.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/salibifesuzebazati.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/99064966196.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/bomifidulodalu.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/90377123539.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/42534552904.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/pedebuf.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/rutexesepotozura.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040853452894.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210906190427.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/pomuxujasapadozul.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b5984460fb2ab1abd2281e722ede4da6/lutinapa.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210907002317.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/3172190361.pdfIn PDF document text
    • http://newmob.it/userfiles/files/88764643388.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/raxorigojoletotobefiju.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wazupevabetituxemidu.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/sojafega.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/60700533961.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6ce1ec65---wolod.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/risupinox.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/jefebamigitadobusaponis.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/defeporuzoxedokozi.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/18671087711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+cod+mobile+points+no+verification+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 17504 bytes
SHA-256: 2533024fb9cf4e24b10ab7f81978b12e3af7aa69ed5f6ab8a61d55e3046a43e8
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11260 bytes
SHA-256: 9f9963100b7987090a01efc9f7236a92eb096ecf716528b29b6e214b2c075e53