Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b1d23223ca747c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 06:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ce522a1820c707747755948c88c7afd SHA-1: 29208c3f2142d3b8a8c1abe384a06665fa105341 SHA-256: f6b1d23223ca747c43b75d7d79b3ac8b3c416ae661fd907080b891846bc0c128
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a high confidence score. It contains embedded JavaScript and a large number of external URLs, indicating it is likely used for phishing or to download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true malicious intent through a wide distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=annual+percentage+increase PDF link annotation
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/20117955023.pdfIn PDF document text
    • http://deltools.com/userfiles/file/tekimazos.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/fizekodesijafewoxe.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/mebebokazevon.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/93369576541.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/25201433612.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/25177777214.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/nusujedoleroxeb.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/tijesejikugapuxaja.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-01/images/files/lupitudivox.pdfIn PDF document text
    • https://htchninc.com/d/files/pozulolewezudamimevazaleb.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/gejubarivijikuwero.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nurafageziwimikoxufatemep.pdfIn PDF document text
    • https://equalland.com/uploads/File/4909045657.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/57871691916.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d66c3c249---duvovutaxegawugap.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/kibatabunumalujugir.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/parepowirakekepemafado.pdfIn PDF document text
    • https://steammining.com/userfiles/file/pozosodexozewu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/43434969825.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/74052530214.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bemebumixewodixigetikusaz.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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 17416 bytes
SHA-256: 8c18a24543f58b9ae55cdb2c47db1eb9c978df60bc1462590a9638bcff605bae
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 10508 bytes
SHA-256: 26cba6bbde8588f61768671b0413f28816ca793c41811b39fac8124950689bb7

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