Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cd02c323d373bd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 07:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db262f03069848921816c987c463c2f4 SHA-1: 285e9ae7727f05aea1a695f0909a778d4972de44 SHA-256: 33cd02c323d373bd885ea2ebadd8a7ff4cfbc3e007afb4449833a0a3a7e21ce7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of these links and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://jhdljz.com/userfiles/file/1631923512.pdf In PDF document text
    • https://ln80.cn/filespath/files/20210912021451.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/34985553140.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/44663794163.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/tafemid.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/5159696397.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/dupifojolafuruv.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/jukigolimagot.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/revemijuxamikiwik.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/xuzatinamodiremapumaruwe.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/muluserezili.pdfIn PDF document text
    • https://mahae.hu/files/files/mepaxinabetejabojilu.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/rowidixizakunudawej.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/61190410529.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/10612921239.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zixezenabukalurukaj.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/90362042420.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15325c152---41256082152.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/domemeputefop.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/74770693098.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wabojawakebimivam.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/86389923403.pdfIn PDF document text
    • http://ranchobg.com/img/file/degujejenuxiguteruvuse.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/69797845049.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/52214250646.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dixupaxojug.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/gasofelozisagofarizil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+gallery+resize+photoPDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 10828 bytes
SHA-256: 16b5db22e042686ab1d9849a038cd56a69985bd63cadf1195e04a7cb339139c3
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 18208 bytes
SHA-256: c53bede68890fd5d8f1372600327760d144ceee9ca0d69a6a17987c4e11a5c44
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1