Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6c9d968c0e7d2f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 04:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cbade29e2a2cf09a98eb8c229b74883 SHA-1: 15f7a3d4ed181c1aeb1d6fea4fb246746aad991b SHA-256: 6a6c9d968c0e7d2f766a1c6521aec20c4039a0bf46c04d7078ffdc15326fd494
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a tactic to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://menu2uplus.com/images/file/nufufewegazutepujalazajem.pdf In PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/totisifujixanizu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905160113.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/ravanowisiwoduja.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/9189189338.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/63449658569.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/30403151938.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210903123553.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/falelolofipuzuviwozep.pdfIn PDF document text
    • http://exima.kr/userData/board/file/sagajagufoxadalivekere.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/mesigeliriladu.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/zakul.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/57999040177.pdfIn PDF document text
    • http://airmon.hu/images/files/sixevopigadivaxis.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/netuwug.pdfIn PDF document text
    • http://iscelenie.info/files/file/kumozasuzumipemawu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/mudufurapekarubeli.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/buxawalekepobeso.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/99887260943.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613960f57016c---gegagigamajifi.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109050422334801.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_7C41D26B0646E181.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a3a261de8---tezukanitulesekisetedix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=game+launcher+for+android+10PDF 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_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 10788 bytes
SHA-256: 3301993c694ac92fc145d0ed52e12026fe908a70e70d740c3068a99385095828
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 18344 bytes
SHA-256: 5a0f049e24bf1f01621d1933e89338542b8b991b978c4b5447f8a3bfc272c9e8
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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