Malicious PDF — malware analysis report

Static analysis result for SHA-256 4274272e519f3e85…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 16:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eabe4091947baa825f6a70a3d12a748b SHA-1: ab8b8a73abc4fdd9d651ef8872a489d1fb8dee16 SHA-256: 4274272e519f3e85e600f6ed2f92e2822a36cd9785e888bded0b426ab7587b69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of external URIs indicate a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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=an1+tom+friends PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/68066dd8b2dbc023f9ac0c31052710db/50625074526.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/38496069750.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/gidupifesizufatefaguw.pdfIn PDF document text
    • https://shibbirs.com/media/files/36222132225.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/78200128766.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/67779323483.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/69895145829.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/fejapominubajodedupuge.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77140405516.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/binobaraxud.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zimifofeki.pdfIn PDF document text
    • https://kildevangen.dk/files/ratomuxidadut.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/11877314895.pdfIn PDF document text
    • http://sjhtractor.com/d/files/81541743950.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/18474862530.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/61962432652.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/62265886740.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379fbe4ae72---kajebiwiregedunaguge.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/vatuxozefisipebolu.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109060529546098.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/74803738982.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/wifiwuviri.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/30202369986.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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 17668 bytes
SHA-256: f0a5c49bb02b00cfd97c737c7ea475bad8532446d538ad4ec5a44bce577382aa
font_02_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 10340 bytes
SHA-256: 234caed1a1bf2c2cf39eb11253ce2482fcb4596afc317068c7f039c9c782651e

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