Malicious PDF — malware analysis report

Static analysis result for SHA-256 d332fc6d8b27c829…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 19:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37f66455c62c03fb91252a8a73cf66bd SHA-1: a0e86fbceab5a17595d39a79992c2a66acc85798 SHA-256: d332fc6d8b27c829502a7e3c7000653e8348c8894b00ff282883f476e6ff972f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, including one pointing to 'queure.ru' with a 'android+theme+download+apk' parameter, suggests a lure to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=android+theme+download+apk PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/028td6r43qbpj8m4btb8te3fj1/nufonewosapamoredolujina.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/ligegibusus.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/57009089019.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/pabugezakagogogevovar.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/15593365430.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/zudogi.pdfIn PDF document text
    • http://leruichem.com/upload/files/dusalafesiwe.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/45803324495.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/54807017117.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/11985444688.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/52413497130.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/xoloko.pdfIn PDF document text
    • http://cl-pub.com/files/files/63243939551.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/55942747391.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/35834655456.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/resujexetibenaf.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50283507b---4471317360.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/bejofififipe.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fowojiligikaxafebodoraviw.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/fewiwuwejakezume.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/96837434783.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/24270658926.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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 10648 bytes
SHA-256: 6520b40ae01e3968214a3f3513973cf4ac8fcf05bbfd2a793b7f8e0827c927b9
font_01_sfnt_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 14660 bytes
SHA-256: 4c16d2527682d1a058bef9ee229a29f381b94fabfc6882377f15f98ee5092ea1