Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4a45d6346b4a9f…

MALICIOUS

PDF

128.3 KB Created: 2021-09-09 16:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f9cba9ee1cef4c0b4ed080a674e6a89 SHA-1: ff8d26404de4bc3daa2005e39136d417db6c25e5 SHA-256: fb4a45d6346b4a9f15a176424cd16d7dfa89d6f9957ed7f17852af5d6e2457df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=has+leaked+serviceconnection+android+speech+tts+texttospeech PDF link annotation
    • http://tuanayapim.com/rsm/files/mulig.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/73656049331.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/dugojesilojidabaw.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gc28coe9l22l6vdulni459necp/gigejaxasiwumerufudan.pdfIn PDF document text
    • http://fkhd.cz/data/img/wigodotugavagij.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/84908856898.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/46000580159.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/dibunakunonorodujo.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/bedomi.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/nunebukubif.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/denaxelugowixowo.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/fusutirozugokurolufoduvu.pdfIn PDF document text
    • http://agronlogistics.com/userfiles/files/zujawin.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/fedewimilonunawot.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/80540452382.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xajimewipoxowebaki.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/towikoziti.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335e5b57dd5---naxewerobadu.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/werigekukoxejilaterepe.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/wegobumas.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/61312611425.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/8568867106.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_off00018ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC3 10860 bytes
SHA-256: 09216279a7cf6b378eaa5c55cb49164a6d0b435ba4cc22090dc6c85c64b006e4
font_01_sfnt_off0001a7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFD5 19204 bytes
SHA-256: c35e1cbb21c6a5fd0f4230190e4d8b2dba3d60a99411c6fe473fbb0fe5c309ca

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