Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba00aa981e9ebb17…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 06:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5ee0d75f6a82aff66a0284c53bc89f1b SHA-1: 21ef1d7ac6da524ea2aa38ad7d8da3a5cb870d20 SHA-256: ba00aa981e9ebb17cf536334f71dae7ecf1ae10067020e1680900fb78c458858
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to download and execute a second-stage payload or redirect the user to a phishing site. The URLs point to disposable hosting, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=append+data+to+a+dataframe PDF link annotation
    • http://uitetenindex.nl/images/uploads/xulivawogipepikuda.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zunomojipolitibadijuj.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/25191212967.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/pijuletiguxidafigim.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161412e3bc5fc7---31493821589.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/20720077355.pdfIn PDF document text
    • http://zzquansu.cn/d/files/30546201914.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/49380642711.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/54861025236.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/60739039124.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/19834765040.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/32273935050.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/budobonamu.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/lixubilepewezisobawekubox.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dobarotogixirobosuwupem.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/xipaxutunevolajosoluxad.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/vorakewok.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/vidatujazuwuwefewawufor.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/zufavuvonigebapile.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/82011769835.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/24038546800.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/39535484226.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_off0000ad22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD22 10332 bytes
SHA-256: c6c824fe3c5c6dc81cbca38c4fa05c7f24935c7dfc350d9bf84bf9f4a5db508d
font_01_sfnt_off0000c46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46C 15512 bytes
SHA-256: 4e8cea1c3966c824a774da833401a845c8c7b1297e0b9779eb87463cde56af07
font_02_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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