Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3559dbcdb185a9a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 07:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f5ad4252f569ca616ffe3633b0a69f7 SHA-1: 2102dc88bd2cae7d455121e5ffe3b5d09643b58f SHA-256: c3559dbcdb185a9a0ebf273413e6a21430892ef9a3e00b945b1c1fa198242411
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm designed to distribute malware. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a link farm heuristic further supports this. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=minecraft+skyblock+map+download+for+android PDF link annotation
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/rigeke.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/69877274497.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138faf5243b0---fasutonax.pdfIn PDF document text
    • http://93564497.com/userfiles/vuweg.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/gelajigezataxujorirev.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sanijijisobilorak.pdfIn PDF document text
    • https://architektor.ru/uploads/file/suvolodam.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f774d63e9a4eeada0347f78524bd0ec6/jubokekigejolozizi.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109091826006281.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/97030634795.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/15683629360.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/molomeni.pdfIn PDF document text
    • http://kasargod.net/uploads/file/bosewogadu.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zafufepiguluvedipipixol.pdfIn PDF document text
    • http://drironcat.com/images/file/1316969408.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-11-17-23-07-40.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kurupowisijuk.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/94673293572.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/14743525958.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/jopuwolurenurexugoloduxi.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/6689263496.pdfIn PDF document text
    • http://kezheng.net/Upload/file/jexevosubapulewebotojod.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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 16564 bytes
SHA-256: 8244a25d3fac84f58652675c8a6dac76e9d4e3988482f073833962e5bb976505
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 11204 bytes
SHA-256: 6bf54073667c68c51d8e5a54eb4774dce8800915aa2c83c2e0029edee3079d7e

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