Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab0ef9ba2dfdb9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 01:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72959909549d3ea106e5141633d5d5f SHA-1: c7ed619e7a88c002f56c2f0ebefba5657f03158d SHA-256: c4ab0ef9ba2dfdb9d702232c82ee46c39e16e351e9409301113479e5e6a3a3a1
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 domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=is+there+any+way+to+see+private+instagram+posts PDF link annotation
    • http://to-kajihan.net/js/upload/files/zunaluwepovajeloripe.pdfIn PDF document text
    • https://palet-school.com/files/files/zadof.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/goxezupejopesuwubenupexiv.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/93832744548.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/patesiwexajibiwopifa.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/saxakubuliv.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/guvupopazumexaru.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/40683606677.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/fedovojowulojotanav.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/luxidir.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/75994791364.pdfIn PDF document text
    • https://airxps.com/userfiles/files/lonepotikuz.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/69527553404.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/47252140733.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/velizideziwip.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fiforotesulowowumejusaz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/98238e96cf40d14d9a30ae9d3fe34286/11427304812.pdfIn PDF document text
    • https://il-gusto.com/images/file/susaxujulubud.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/texojewaripesuwusozugite.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da89d98cac---bidetizepisegif.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/wolorulimazar.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/99862002734.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sofuvemewejadajumuvu.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_off0000afa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA9 10872 bytes
SHA-256: a1e97b4d5af96b451058f5862f0dc9fb50cf0252976a17e2dfb4da874d84d98a
font_01_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 15352 bytes
SHA-256: 0ee4739e017b9b172095a26b93a91a598217274204e53bc13d23e5319e330d85
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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