Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46da0c581393e03…

MALICIOUS

PDF

92.0 KB Created: 2021-09-21 10:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8157ecfbce0dc73b5d7cd3c118e11dc SHA-1: 9c6819a49f70a8cc52072f6be6226ead944a49b0 SHA-256: e46da0c581393e036f7f9a8dc2bbd72d46cdf605198698ac1aed86354bc87e0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=where+can+i+watch+the+power+ranger+movie PDF link annotation
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/43272036344.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/luroguxelapinomesumo.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/51718120269.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/pezuba.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/xuputatugonik.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/51814255203.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/suxubiguwomine.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0sddgeljk48sqenh33669970ra/zilati.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/depusupegubari.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/vipizebewurinax.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/dimokanefonukem.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/nexabufibaseno.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/puxojiniwoniwovewowekuz.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/21539596141.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/rizovawatixuputulajupiv.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/pixobudafanoradi.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/nebexijesinozodejopi.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/zopilamure.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/37275064431.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ac1504217309c5f819b8f8bd26a0e462/43687589186.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/56170872013.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/gutor.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_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 10752 bytes
SHA-256: f85ebfb08b0131600c12df33c3eecd9ba956a75ed07341feddf551d22071460c
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 18960 bytes
SHA-256: 5f8c705a905503c55d6012e330360fd8881f1a87e20aa2603f6345dc056128e5
font_02_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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