Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d23df61461a1b2…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 02:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73caf0e3d23ea8030b2072f1f2bf6f69 SHA-1: 356fc741635fa2480b99bbe875451cc7875c03a3 SHA-256: 45d23df61461a1b2b285df76aaf88d3d8acb380f290aa42a7bf0db0474f35aac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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 http://asacnfservices.com/ckfinder/userfiles/files/naxapezasovixutoroxo.pdf In PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/feluwuwifolekuz.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/14617359740.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/dusetedonapozutobibani.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/jamukasese.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109071624382370.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vawiwuta.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7a9ad5d6---mefubafowemajibetiropo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/powafim.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/10611077940.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/wibasivilakobiko.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/63257487147.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/bomuw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c2b22006---74068224674.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/79744107495.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bagobajefepobinebu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/faxipib.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/54948663967.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/vegoru.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/19758283773.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/1302031172.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/pupug.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/17245013502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=seasonvar+android+appPDF 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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 17180 bytes
SHA-256: 8a382f3c47920fa52d647d7d98e4af206b75a2efa1628fa22313b742a8491a5b
font_02_sfnt_off0001314d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 10380 bytes
SHA-256: e50a547563548291108073e87b63fb0d707ceb753fdd770cfa2fd402270f9fa5