Malicious PDF — malware analysis report

Static analysis result for SHA-256 831022e161156bb6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 18:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c1079f23a777d73a62cb14e0287ae07 SHA-1: 446457dfac73adf26f9d56a03f1a61e0a9c2d570 SHA-256: 831022e161156bb6171be978cd84450fa9b3d65f0b200e2692228b799b5ac8b0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, suggesting a phishing or spam campaign. No scripts were extracted, but the presence of many external links points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=how+to+use+startactivity+for+result+in+android PDF link annotation
    • http://goksirlambinowice.pl/img/upload/files/kekos.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/34121112089.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/7484815564.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/ludigukuv.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/56885030718.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/69677808331.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/pasumonalowusaj.pdfIn PDF document text
    • http://dfanchem.com/upload/files/gokunowumunusefogutik.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/44550213795.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/4030307233.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/zinuxanonufitotagonazimot.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/lozixiwasemizodexas.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090815461175.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/31776449378.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/52670054258.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/sexazotivufuvunun.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/30a28670f37f32fa99e36996e18fca4e/vigup.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/85142277524.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/52807857594.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/96979772783.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a655ec137---dopevovuwaporixotejos.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/96039801637.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/79405979748.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kevuzera.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 22492 bytes
SHA-256: 8786fa25d670ce6db57f7a6d879cdafb901b4158b56c6a8169e934d67b2895fa
font_01_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 10824 bytes
SHA-256: 070b0e5111796ca9ec5794e43b47faf6ba37f55349389ca1df6701fde139d0f2

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