Malicious PDF — malware analysis report

Static analysis result for SHA-256 a035196c5c7643fc…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 12:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6448ceab0fe5adf65993999ea0382328 SHA-1: 7717153103607c9bc227064ec302867101ced2d8 SHA-256: a035196c5c7643fcd0e4ac58c374578167f543d1a3167b1aaa39b0121517b940
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to the listed URLs, which are presented as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/venowokut.pdf In PDF document text
    • http://www.parinet.fi/tiedostot/files/73542330126.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/lujuwivoruxagesil.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/80940410060.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/mazivogofuxumiw.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/kutapoxo.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/mivizevif.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/67548894580.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/77151913755.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/43498991226.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210921222944.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/32813023142.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/77215356372.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/vuloduripi.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/nosazabilo.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/zavofesozipip.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/94454394561.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133590a42ded---75934280287.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/lojawu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b82d1bbe---susojidefakofewifivebi.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/ravufodepike.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/sebijexokobikivif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gynecoid+pelvis+shapePDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 15208 bytes
SHA-256: 2bb16465bec451163350f1a1208f8034e5d958c1e05068e60948bf6847cf1aba
font_02_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 10632 bytes
SHA-256: 396abc1fc289c8e7e94c11e0c2bea248289baae2b2cf60b0c9bf72751b5e23a5

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