Malicious PDF — malware analysis report

Static analysis result for SHA-256 d622f7c9f66f28e8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 19:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a046ffcec34707fef6d4445626ce2060 SHA-1: eeaa586ef0c11b868859892fcff59234c4e7b441 SHA-256: d622f7c9f66f28e8394c043e81ecc7b2e0c5803ba248f45f1bee3189d7f5f2b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=how+to+activate+voice+recognition+on+android PDF link annotation
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/veweg.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/noxasaretakerulijesufa.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/51911892593.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/12615877558.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/48151114137.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/kimivewikigixuf.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9b1f0d67---64610501517.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/55809718369.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/20306072589.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/75090263987.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16584195323.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/18130382854.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/66690218057.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/74863255985.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/foxukowunevepokezupofe.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/jawetupo.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/54177755024.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/94204974216.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/39213711859.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/86813151181.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/wenisakosaga.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 10472 bytes
SHA-256: cd41530b53247225d2d5ee044c2eac8b1291b2b10f30fa4ee3d33aca9822f893
font_02_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 18516 bytes
SHA-256: 5fc67ae7900aa4067407598f72f4810a2539db1183a1b05f27a5fdd261ee3b7c

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