Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b9420f2ddb6f03…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 16:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35e8e19616f5b4eff63d4331d7f9389d SHA-1: 72dfaf793e09f4d49f6acfb2ac901a75f14e2bbd SHA-256: f1b9420f2ddb6f03c43cba76aec4f97c25dd9f81a1668f3525394d08d6254883
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with a high-confidence ML classifier flagging it as malicious. The 'Remote-support tool lure' heuristic indicates the document's content is designed to trick users into installing or running remote access software. The embedded JavaScript likely facilitates the execution of malicious code or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://shangrilatheshow.com/ckfinder/userfiles/files/zopugebotogun.pdf In PDF document text
    • http://vntattoosupply.net/uploads/image/files/45531577144.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/mizome.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/fezugekimibesetivuw.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/jubimes.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/lasiset.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/betojebitudiladekanen.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b2c2eda1---sakavisiporuroliwiral.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/jarexemijididukobezatojip.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091600521061.pdfIn PDF document text
    • https://rcot.org/userfiles/file/52892429256.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/loxujawemefivoli.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/29308925655.pdfIn PDF document text
    • https://bawauang.com/contents/files/91628956515.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • http://elitk.ru/_files/4709322702.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/weziperad.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/subafi.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/pajejojexoguwuk.pdfIn PDF document text
    • https://projetovm.com/uploads/files/pobalikarikonifo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/bupikimekizotit.pdfIn PDF document text
    • http://ippon.lv/uploads/File/nasiba.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/59600855636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=openoffice+for+android+mobile+free+downloadPDF 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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 17468 bytes
SHA-256: 5cb439d344f41f8f0fcb80a4213c12396a3055521a0135247b7171e80f5fcc7c
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 10764 bytes
SHA-256: 76e46323723dddb918a99887d56a27191ac3bf4c1137787bab2fc3faa33413de
font_02_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1