Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c0309965188a83…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 12:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d43f961cee5ba12130e6523c2a001042 SHA-1: 6577206a3c99de88afa01b69ce8c6136f5ff8561 SHA-256: 07c0309965188a83bf19f9f1349b662cdf160b80ad3d9f9751fc0bd384370f06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent to direct users to potentially harmful 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://vegman-kzn.com/ckfinder/userfiles/files/97962032811.pdf In PDF document text
    • http://leebyenghun.com/new/upload/board/files/jefoj.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/50520319185.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/15137411184.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/51332931565.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/beditipadedetapimavum.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109070848556441.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dewogakis.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/68684213.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/nedejorebizodawutilub.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210921191547.pdfIn PDF document text
    • http://riosemarescentrodemergulho.com/ckfinder/files/21838092508.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/23717f143a80aff4f34a47835b65ed83/bukoro.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xopalidixapi.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/50863269580.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/92568508926.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/pijibuxokusopok.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/94289208927.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/42317954924.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/73711662162.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/donabe.pdfIn PDF document text
    • http://boldogelet.hu/media/kuvibo.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nanufewexodaxin.pdfIn PDF document text
    • https://kaparatt.com/images/File/farobufu.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/50394917413.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/sarovuwinatisuguviketudit.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/guledurad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+password+remover+and+jpg+converterPDF 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_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 11108 bytes
SHA-256: 647d3af270ac9518aa45442186d7e5ed60b871224709af6fd6101fb5259ba2dc
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 18832 bytes
SHA-256: 8d10a99d560fc74db362b6ccd803cd7c5aa6efb251065ccaebc8eb38f0f61fc9