Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9390cb64427a517…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 21:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fe90596d3c057ac034876eb75c5cfb4 SHA-1: 249372f9400cf15ac7e33e3da085bf8eb2b535a1 SHA-256: b9390cb64427a517d8c91eb19ea25d7f3974a4472fa0cdae8b5d6fc13f5ef3df
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the structure and heuristic firings suggest the PDF is designed to redirect users to potentially malicious sites, likely as part of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://fabriziocar.it/userfiles/files/sosifu.pdf In PDF document text
    • http://planbmedia.hu/files/romirozugulipan.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/bupoji.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/sepuniwedu.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/18590764240.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/15186843300.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/25044534652.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a7332b0df0ade509093c4dd99872dfbd/19109337303.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210912164517_ztg5pz.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tubow.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/vexiju.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zazuxeb.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/xasojowabav.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/932426829.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/tamufapajator.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/21275702636.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/49653327226.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/kaliduvezugireka.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/97312970679.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/13039023044.pdfIn PDF document text
    • https://trieurodata.ro/images/file/wamorodafilafupafi.pdfIn PDF document text
    • http://taociren.com/upload/file/210910181457695376p02yv1d7i9rv.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/41666556100.pdfIn PDF document text
    • https://cartolmania.it/file/1815050773.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/folurivevelagigodofalex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=magnesium+combustion+reactionPDF 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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 18260 bytes
SHA-256: f31d412ad9bbc2dce5abcb74baad4378611d0cd4a88a213933ba98a4d979a42b
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 10760 bytes
SHA-256: ee6aae2113797367f6ed2aa14dcecd1a323acf48b5d18e800c05dae2d4e3de90

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