Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ca2349c0e176a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 21:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce483f177dd3d3011a9299362d27bc5b SHA-1: fb96f07c9af33d8ed1031e7640ccc4a94440a498 SHA-256: e33ca2349c0e176acc9dcdf92b1de66ac0c2ffeb0598d55d8a6d14c52cb17211
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, pointing to various domains that appear to host PDF files, suggesting a phishing or malware distribution campaign. The document body was unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.szphotar.com/admin/img/files/84658940936.pdf In PDF document text
    • http://administratieindex.nl/images/uploads/disolizogejas.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/48742327588.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9450cb231---jewezebox.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/9884495486.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631526922.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/korimer.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/latopedibolivap.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/rinitekevuvi.pdfIn PDF document text
    • https://asiapharma.la/files/files/jifexomujifutevawadofere.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/71886540427.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/91509640921.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/tuwilesogejalomu.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/14120254076.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/negapirevotodezavoku.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091300113273499.pdfIn PDF document text
    • http://rinsacars.com/files/others/vepomozi.pdfIn PDF document text
    • http://evola.it/userfiles/files/zojajavorube.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/51295332286.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/67065050248.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/48780917610.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/relopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nioh+2+master+swordsman+smithing+textPDF 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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 10936 bytes
SHA-256: 982543538d73eeb689e4c064430804a5f5f5b0ccc91824fe54e4c0dd2138f94f
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 19800 bytes
SHA-256: 9b2494b3805ff09943f35a154200322a836e4f694664775d0bfde52cd607d762
font_02_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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