Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c06f7dd16aa95b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 12:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ef79a28c765aec72c2703bf275b9f06 SHA-1: 8ecb7e29c1504b76a25afa8b859bd2bd82d46fd6 SHA-256: 14c06f7dd16aa95b9c6bea0376818d7eb9df0a14fdff0679546f88bb3532920f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, many of which point to other PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://nutrishop.in/ci/userfiles/files/81558422691.pdf In PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kogowewuzuboduzadunu.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/luvoregif.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/nidedepozefone.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/lojowigu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c41c664b---52704102634.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/70896249284.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/55533133522.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/56589368862.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/12416454152.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/32982950577.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/raxomeponifejaxisonadafev.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/vivaze.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/pafukuterasowa.pdfIn PDF document text
    • http://fitviewer.com/files/file/guninovigeputebazulugot.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/lezipatubutizexo.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/14153102748.pdfIn PDF document text
    • https://fasleh.net/Files/files/jigikabopuwo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/taluxurese.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/31355382258.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e102313001---pexedebotiderupigetono.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/89849375997.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/rodewewes.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gibuduvura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=thoptv+dot+apkPDF 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_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 16024 bytes
SHA-256: 7d19e51a26425706e9027f6a6bd03bd9f9ee867e01ea7aa55d17134ea2d614a7
font_01_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 9968 bytes
SHA-256: c9bf90ffa5c7c64917a78e94d6b4996d4c6e486c56c67f623ea28dd7beaf3fa4