Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a1faeb197d9714…

MALICIOUS

PDF

96.2 KB Created: 2021-09-30 12:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0ebf3867a60d5bb7bceee46e1cc0adc SHA-1: aa7ca726dd79fe6191b2d5682f80b282c4a70ef1 SHA-256: a9a1faeb197d9714f89e640a402258a15f2bc23cdad178791ca730b11d2f9e40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://debsecond.net/UserFiles/File/daneputu.pdf In PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bibifumip.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/gerelopakopegemitademakeg.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jefasisemitof.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/40753704674.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/melowajo.pdfIn PDF document text
    • https://plasy.com/uploads/file/7951731796.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/lidivuziwomijedefote.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65400805645.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/pofata.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/43681786362.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/29220609549.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/3094381437.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/17913488518.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/57437830427.pdfIn PDF document text
    • https://aneri12.cz/res/file/rupupogilotabinivubirune.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ed60c4f16e75dced821b29fb2e591480/47656529495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vodafone+apn+be%C3%A1ll%C3%ADt%C3%A1sok+androidPDF link annotation
    • 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_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 20336 bytes
SHA-256: e8e4e89a129bab8501b9e5d6e4c56332b4230ce47c51c2729d7d773e6c10dc00
font_02_sfnt_off000158f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F5 10932 bytes
SHA-256: b40230a8b20cc882a773207669e254b360e85ec4b3192a40d882d56410ae6141

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