Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48d2a7b51d45636…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 02:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d70b446299b59273738aea8f2beba65d SHA-1: 45cd4e8893f650b4f2d72bfcffdc50edcc71fbc2 SHA-256: a48d2a7b51d4563693f09acb5b31243acacb36d34801674daae9915f4327bace
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://escolaalfa.com/userfiles/file/mopogavizerojatasuz.pdf In PDF document text
    • http://alltechsro.cz/files/gunodejaleviwot.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36419754309.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/96899180975.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/nakizovapux.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/7610002907.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/mibakumifofupow.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/71586580461.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/51006962427.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34762911507.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/papajomefoniki.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/658428f50a28fc251c1812d30f05f6ff/19594502378.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/wejegimidubefafipivorami.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/futujilizewanolovotex.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/zagalobexajegebavikojakef.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8180487947.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/farupodevexuwilamez.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202110452018.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/nexabiwukifek.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/39633764342.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156aed16a0dc---23905210570.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/fixaleziramomewu.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/doxazosexi.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20211004010842165286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hole+in+my+heart+chordsPDF link annotation
    • 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_off0000b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 16460 bytes
SHA-256: 7124f4059a70319e75c26526e8be0b13885fc3f37b214adc564128aa9b4df757
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10740 bytes
SHA-256: f5c2764069b5e6a49f73f2b3fd8afda9f761e10605d083f0bdab1e858108d9a9