Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba57f1f9847638f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 21:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eee7b05852a703d401fd6b4cac32dea SHA-1: bb5e404ad8900b83cfdf651667aa431d0fa6ce83 SHA-256: 5ba57f1f9847638f1f9b2c0c10e95530103322becaf70a828c823873891be2e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and a large number of external URIs, suggesting an attempt to redirect the user to malicious sites. The presence of a QR code lure heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dreptultau.hotnews.md/upload/userfiles/files/sisewasubafifuniviposab.pdf In PDF document text
    • http://dga.gr/ILC/img/file/99992730787.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/korudi.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/pagonekuxudukukodo.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/23322190070.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/40897226028.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/57773697377.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/71740371271.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/nexosorudoj.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bavejibatabamaborinif.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mureforubanitanimajuxunon.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/24599888626.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/kupigukapekonoke.pdfIn PDF document text
    • http://jawarakreasi.com/file/24698429788.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/kimelagabameriki.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/nekeji.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/96305003060.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/pizaxirulelawinuvuwakumuv.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/55000015130.pdfIn PDF document text
    • http://stylekd.ru/files/fenelinomizegerigulotuwi.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/wumuw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc1747213---mivukegod.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab8c0382d---10713325706.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/dudebaf.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/51347363084.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/64969732485.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/14202558870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+read+a+qr+code+with+an+androidPDF 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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 17452 bytes
SHA-256: 0added8e537d3c8cbeaccdf8d1e61ec63739d8a2e9ea5d691d554b255809f940
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 10688 bytes
SHA-256: f6f23addeecd2e7a43c51c8c7dfe5059f470a3a1b41e1af47a222397a44ce2b3