Malicious PDF — malware analysis report

Static analysis result for SHA-256 9158875c46db13d0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 09:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0259ecf063927d8a66a6dd1591ca09f8 SHA-1: 00ed2930c63281ab88e35015ca6e7931b810afc8 SHA-256: 9158875c46db13d07c8122fa51dd6ce149fa7d98533b9af5ca07811acdc2e95b
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, many on disposable hosting, suggests a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=mod+apk+hopeless+land PDF link annotation
    • http://stavclearing.ru/upload/files/vidimezo.pdfIn PDF document text
    • http://gaudi.tw/upload/file/rebaxagavodoxalulug.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/70014687848.pdfIn PDF document text
    • http://nineslash.com/user_file/file/98418148344.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fifopirodekovemexesujogi.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108312347073770.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/varopepu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d89df81a---76268886355.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/wibunilamilokurewaxo.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/divezulemezaforazip.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/navuf.pdfIn PDF document text
    • https://phukienbep.net/media/files/20014344157.pdfIn PDF document text
    • http://rapet.hu/files/61232669688.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/44186515386.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/gijujejobigud.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/56586718487.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/nukazomaxapedetas.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/54383764832.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/ribego.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wuviwabedefobi.pdfIn PDF document text
    • http://risme.vn/files/vebewetimadulibuv.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/41720566740.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/wovofipoki.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xofugab.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 17288 bytes
SHA-256: cba63c16fa38b4ddf3b8a3c344286996f03a599b264f15e360f3ef85e268b9d2
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10284 bytes
SHA-256: 6c98c55129bb33db6df9f553576d8e441144310bec63892072b88ba291b2069b
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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