Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e0e4bafcf7b11e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 10:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b4291ae30d31daafb10cfaae7c05f07f SHA-1: a092418d9aaeede244b15df2cf3f3881ebabb2cc SHA-256: e3e0e4bafcf7b11ea94145396780b2fc71b104ad11587419fa7f572bf2b9bcf9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware downloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=nox+cleaner+free+download PDF link annotation
    • http://archiw.gbpopatowiec.pl/img/upload/files/kepivopuwanirasazosodasax.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/serumezuwuxudov.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/tixefiparudoruwuwefuzeda.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/kewunut.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jusakikapimegifukanedawuz.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/fufomiruwomejeponuwa.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/visifuwijimawi.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/widelubikorukulumad.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db2f5a2a9---togiruxibinavarujid.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/67753647574.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/51849739652.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/86339333076.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/nekekuwewusevudoz.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/lenozikupabopam.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/2202696421.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907113414.pdfIn PDF document text
    • http://itena.si/uporabnik/file/riritarewuzefejirew.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xozoruzimebobobunulorab.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/vupapejitejesajabez.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/kurumosadizudinozukozinu.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/silawezu.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/fetajipige.pdfIn PDF document text
    • http://myslizdrave.com/soubory/dopurafusuxitigakelov.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/pomasukumagexizejazoz.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_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 10276 bytes
SHA-256: 827b0b778b3662e6cfbd55216d782f7defafb49315288449080b46929c7ff93a
font_02_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 17064 bytes
SHA-256: b1e7f0ceaecad415382e1469c85daf43d453bf9cb067ad23300f3ee62ff2fb78

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