Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dade8a46657ab53…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 12:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ff89992ca60b6f4773f5e4b3aba1049 SHA-1: 68de37d187695a5628cad176600bb805f1b76a71 SHA-256: 9dade8a46657ab536873baa7e36b888c2e0ca793bf3b9e8279c41cfb8c24e3e4
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms, suggests the document is designed to redirect users to potentially harmful websites. The primary function appears to be facilitating the distribution of further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=apps+like+ldplayer PDF link annotation
    • http://trips-in.com/ckupload/files/99739033546.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tutixajifexepujuburorefu.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/26326934333.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/pozaxalulanaz.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zuruzuwu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/55846384766.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6780490fea87f95fa932ffd611853522/topepafozazapefe.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/xabekafezig.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqg0rk7r81usm8b9u3780s21l3/fajakevisopukumel.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zovevojadewoxezijoxikazif.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sodamusegupu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lujebufosofep.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/36211968719.pdfIn PDF document text
    • https://podimercrm.com/img/files/2770931821.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/pazawajidudakufovanisasu.pdfIn PDF document text
    • http://special-pharma.com/upload/files/57953739276.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/9278036330.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xivarafafewewazadexaw.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24848694907.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/67861708916.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/51033210764.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/suvusetiwibonuravoxiju.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/wifijed.pdfIn PDF document text
    • 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 10248 bytes
SHA-256: 76da7d33a2310ebde967ab89330c356a28c5ada197e5cf02d155b6fc4cefe56a
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 19452 bytes
SHA-256: eefb09d55c319cf55b1eb21c9832f4e77eab342fb499d6748db49b3c57807d21
font_02_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1