Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7c532376b4c037…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 17:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 045d1c08a8627777ee46e502134683c1 SHA-1: 91e9b486ca3ee038862ae59f55844c38807d69fe SHA-256: 9f7c532376b4c037f79e0002e2aa98bfc14268d5333adb4c74911264d2d10278
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://consorzio-csa.it/userfiles/files/debizijonesezejebuza.pdf In PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/84173530814.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/38134641039.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/luxitadobazunaxur.pdfIn PDF document text
    • http://c-six.it/userfiles/files/65482622923.pdfIn PDF document text
    • https://dintek.eu/uploads/file/67837168092.pdfIn PDF document text
    • http://unityproductions.com/upload/files/26542700513.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/9634165258.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/22066431603.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ribotawoxa.pdfIn PDF document text
    • https://tigaintan.com/contents/files/30810815476.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/puwemefifanenizuwifejof.pdfIn PDF document text
    • http://underbutter.cz/download/foto/99489029750.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/93946199423.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lutuzenukuji.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/fuvukemavitaxitowajusetiw.pdfIn PDF document text
    • https://podimercrm.com/img/files/13506934686.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/55904449115.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908230007.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/belafimusijadififunenes.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/62557546884.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109050029124349.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/kogidujapajuro.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/lexuzolob.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/moginozofitija.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/pumugikirejumoguvezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+snap+camera+from+zoomPDF 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 15096 bytes
SHA-256: dadef6db9ed41071125964667bcaa9b4d76aa7b864858f1132d4a9a054614b9e
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10704 bytes
SHA-256: 216f0dcaa0711e015e17bd57f2ec1155a94ceb785023dfcbcc00bd86f3977682
font_02_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1