Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818f4fdca035b65…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 07:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e78a494a5014e3e5c07eb8706e642260 SHA-1: 36b30c48acba757b16f3f0e6d192b457487ce2bf SHA-256: 0818f4fdca035b65f994bb1f3bc12deca762fc17bd20d50464eb6e5faf7112c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with critical and high severity heuristics indicating it is a phishing trojan. The presence of embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=bluetooth+alternative+android PDF link annotation
    • http://reversetheclocknow.com/ckfinder/userfiles/files/22898115846.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9308c8582---bikadovarumewo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/54981016059.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/salezaxopu.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/nibujajel.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/46496015143.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/xeludapobenenegeteni.pdfIn PDF document text
    • https://shidoremicrosys.com/media/13950177164.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/lafazasanu.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/57312391543.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/34260440209.pdfIn PDF document text
    • http://topflexsports.com/uploads/35100315542.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/gemubuwasupizukor.pdfIn PDF document text
    • http://contelex.it/userfiles/files/56326758125.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/20865328837.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/jukedap.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/fanozame.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xifudaguroweniginuresew.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mazuxegefatejuvovarile.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/20855011767.pdfIn PDF document text
    • http://guitarenko.fr/img/files/zabuwenukapabiwovuso.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/xedutivivezeratalu.pdfIn PDF document text
    • https://efnnma.org/files/file/76149256567.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 18172 bytes
SHA-256: 974783bb07ecaf41d0e28464a1a88987fb8013a589f9e0d367087e938a7d10f9
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 10396 bytes
SHA-256: d8da01219c07a1fa4d39dbdb4a2236e92fe9ca43029272ec6fe1bfff60a361c6

Open this report in the interactive analyzer, or submit your own file for analysis.