Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c506dbcf4b95619…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 00:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5687439b6a0d668171a7dda45057cd7b SHA-1: 26bf02f8cdeee9f32a399c736bb022985c50f3be SHA-256: 1c506dbcf4b956195cab409db87858d323a31fbfdd5a50b73a0981fbcda75d1a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://allytemp.ru/uplcv?utm_term=download+thoptv+version+38 PDF link annotation
    • http://bodemveenweiden.nl/bodem-veenweiden-img/99298491784.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/78983043577.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/36082010037.pdfIn PDF document text
    • https://majubesar.info/contents/files/jugurefulag.pdfIn PDF document text
    • https://loyd.rs/images/file/xafepubosorab.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e143421b64---kuwididisi.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/kuropuferozugedewojul.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rixemixoko.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a67ddf5d991047da6a502ab3d0d6226a/48764310198.pdfIn PDF document text
    • https://thietbigas.net/media/files/94664682960.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/xatofesesokagamuvikizu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/nofuw.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/65032278530.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/lidimilewamivumoxasudof.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/sufatunisifajosodo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210910105134.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/83474577653.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/28047135649.pdfIn PDF document text
    • http://calisnt.com/uploads/files/jojoledawog.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/foxunirunefov.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/rudesagegolixuzixojaxedep.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 17588 bytes
SHA-256: abf35268d127934d65b470f44bd1155e4d57bad411c9d1b72f72ea0f4f88ec32
font_01_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 11020 bytes
SHA-256: de67ec073c2454baf37225d4b232f839ad70e6cece356680b282b41dc92dfb59

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