Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb1af1ea58027c1…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 00:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfed27eb137281fb4896513d8f275195 SHA-1: 8984bcbce5c836c2c0af22efdd7c8c1df255ffa7 SHA-256: ccb1af1ea58027c1c4142a8b39f88cacca5a18ea8e01a60f2368cf8b2124b646
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=the+chosen+apk+tv+box PDF link annotation
    • https://reaga.net/js/ckfinder/userfiles/files/54279957469.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eebfe9c2dbd2caeb6148621a3664c87c/9618639927.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/rozezutenatigak.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/1399944608.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906222825.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/tufipixolak.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/90153792393.pdfIn PDF document text
    • https://baptistfriends.org/media/58953731702.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/24510801226.pdfIn PDF document text
    • https://lesura.net/userfiles/file/sotegipusivinizisaneka.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/83284325479.pdfIn PDF document text
    • http://bscartridge.com/pic/6884814769.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/zagevajusisepatuduwegaka.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/32909236032.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vosujifixixiz.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/37844027785.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/50779003485.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/51040757208.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pugutobesez.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091811072515.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/gasuretiludipakufej.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/11423256393.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/retemogofegifelopetirali.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_off0000af9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9A 16112 bytes
SHA-256: 1ec11275f002656bd32d46de9ff10b74c9badc3ba8f7aa9f542b448ddbc5f89b
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10596 bytes
SHA-256: b6e77804d79056a77bb90a211a233abae67ba05e34c781ffde00a07df68ae37d
font_02_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1