Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8b7ce193939363…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 23:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3879b6117f78ad5ae0943cfc1cd05a39 SHA-1: 16d6d41cd8058f61263971b45da92fd81a3594fa SHA-256: ad8b7ce193939363860840011e817437fc86ba9fb66040c4925245dd025c3fc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or scam campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+5+mobile+android+ios PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee8dc6c7a---fivixaxepemufidajifar.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/85214759095.pdfIn PDF document text
    • http://canvangdientu.com/images/file/xeluzawefuzijafovisage.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/60575457298.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/zareramizevu.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/xexejotiwalojira.pdfIn PDF document text
    • http://drironcat.com/images/file/99775655058.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909075321.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/63358385715.pdfIn PDF document text
    • https://actor-conseil.com/files/file/29301204865.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/92710517881.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/99787611587.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/68029149801.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/86135455616.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/vujaguwiji.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/117962036a6fcd7d5d4e6e9a9ce4ef42/11383508923.pdfIn PDF document text
    • http://capri.lt/userfiles/files/gazobikawutuze.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/58855689930.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35316964204.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/78912988349.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/nilagobevotim.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/66024925249.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/89315913356.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/68604435594.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/nonotadozikumux.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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 19448 bytes
SHA-256: d608a036b9673250339109bd4d1e34d33cfbcafdd27050c8eb15beeb0a0321ce
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 10724 bytes
SHA-256: d47b02d84fd53b04166fe0c77267f395a24fbe9d2e0f0b6a7b5f16dd8c120791