Malicious PDF — malware analysis report

Static analysis result for SHA-256 9887606c402ec0b5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 11:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cb56fedf5dbe52409e11e53170a727ac SHA-1: df6fe61e41a16ba4da16c3559defff04ba5e87a4 SHA-256: 9887606c402ec0b57db12a58495d9f95dba07c7b8d535cde33aa9cd96f0a3459
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://smidgel.ru/uplcv?utm_term=android+operating+system+description PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdcb89dd4---lujutipazaf.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gunexuwadax.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/talogeta.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/jodopalegexogiwimumizese.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/valelukolaterelozudexavi.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_221457.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/9333577069.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/pilunuxud.pdfIn PDF document text
    • https://techlan.pl/files/file/40844217816.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/mebuvizozezovir.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fiwedigojubatukakan.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090901573580554.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/95021534039.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80c262639---miroboxuximoj.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/suzerirefexutibawogelig.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/60284455184.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/98062575506.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/93615318797.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/72018592472.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/sarurowo.pdfIn PDF document text
    • 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_off0000b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C5 10904 bytes
SHA-256: 55b4c5c6fac103d34344dfa8db140deaaeff19ac0098f476c392847f89e2036c
font_01_sfnt_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 18948 bytes
SHA-256: eb30bb94c417dd7bf087a8d319a8531824d52790820f9b610f357cfa3cd9d3eb
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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