Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1ee398a0742a1b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 03:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 018e07aa5f291183d4dc5c111e52f7a8 SHA-1: 2097de4de11e793314cbf97dba13ba9774b88d3f SHA-256: 9a1ee398a0742a1bcc9dca6c3265d657a55c62ff5ddff45e0b165b6b94f2f02f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, such as the identified 'crewmak.ru' domain, which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=joy+live+video+call+mod+apk PDF link annotation
    • http://parfumland.sk/upl/73481561627.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/90udlavu0sq288o0jvvlg4106t/51233159924.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/nosoxiloxowalegi.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/28188416070.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xagetig.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zelalebenarumapebuwizude.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/40492331262.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dorofol.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/35290182820.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/zikabavejaboxonasedogowad.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/silojawapaki.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/fexudaw.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cab7b691305805ee918ff4fa221c57b8/vipakevakepajikiwitogim.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/86489168333.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ruribivaxeti.pdfIn PDF document text
    • https://servicepapik.ro/files/sibofosutujino.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/54001997765.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/voniwuran.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pajuteweriloxudo.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/laxemajobenemivok.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/87238359274.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/loviparopi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/pelanesizewemuxab.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_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 18528 bytes
SHA-256: e4bd59710a24704391fa9ca7a876fa2764168824fe1167ac8b703a59a7ee74d3
font_01_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 10468 bytes
SHA-256: c475b3e18a842efb5824da795506dd6c798e7cd2e152c662b02f5353958259c5