Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdbb8909ddfffb5…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 18:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fe578e3fa3bdc4255a3a92ebda2353e SHA-1: 27e113c9b9154807d0bf406eed9e87a22b664789 SHA-256: 2fdbb8909ddfffb5b18be90e0883140d634f8be188c683783b1f48ac73a6fe4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the presence of many embedded URLs, some pointing to unknown domains, supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://korsorlampang.net/user_img/files/puzolewevarodalusoref.pdf In PDF document text
    • http://cwpni.com/userData/ebizro_board/file/kanobufetoxobub.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/29731359002.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dubifememobozivexesetu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab313ea0f---30658641161.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43500939412.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vawiroparitifodewexe.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/kimilabal.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210922175313.pdfIn PDF document text
    • https://securitydm.net/slicice/file/xuxajuxifalufoda.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/34753760374.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nuxorevirinupuzaturi.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/69144123595.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/79240897920.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/2694630281.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/59377218286.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/54234621700.pdfIn PDF document text
    • https://successalpha.team/upload/files/72635738336.pdfIn PDF document text
    • http://slsnn.ru/content/files/47181454462.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/xanereribuledakerumo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613116a4ab358---69830821697.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/68788706789.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/39582731817.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/liruxapi.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/29651138887.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/duvofidojozavimobamusiv.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/tekokefo.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/34212877588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=oneplus+new+software+updatePDF 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_off0000bc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0F 17060 bytes
SHA-256: 443593e211771549338f535f59f19f3fe295c0e234a5844f8b3ac3b0e78042d4
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 10612 bytes
SHA-256: 253c9b97387359f8551c31e0b13ace883d52968e2cf1f14b23f3cd6fd0bd5188
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1