Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8b3c878aba2a3e…

MALICIOUS

PDF

80.5 KB Created: 2021-04-16 13:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 801a8ca85c0f6ae5151e22fae92df9a0 SHA-1: 51f26b3e39a4ec9221d7cd2fdebb4a1c518593f1 SHA-256: 1a8b3c878aba2a3e19ee694a37efd4b9ef8a1f721c6efd891c365af40d88c04d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=spark+john+ratey+summary PDF link annotation
    • http://giwewewobarijis.22web.org/misujapofis.pdfIn PDF document text
    • http://sosepojidoduxad.iblogger.org/bapametedoxuxixorom.pdfIn PDF document text
    • http://jevopapivixepe.iblogger.org/happy_chocolate_day_video_song.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/java_programming_book_bangla_free_download.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/redekubetago.pdfIn PDF document text
    • http://jisurokaz.22web.org/balenizoxamijikexiwopog.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/quimica_inorganica_atkins_gratis.pdfIn PDF document text
    • http://bosuxezaxad.mypressonline.com/81613928106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigitepusiligo.epizy.com/274306527.pdfIn PDF document text
    • http://naxokagad.epizy.com/ionic_script_template.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/algorithme_pcime_2020.pdfIn PDF document text
    • http://xufutat.epizy.com/37373215789.pdfIn PDF document text
    • http://jemileti.atwebpages.com/45002888710.pdfIn PDF document text
    • http://wivowutone.epizy.com/adding_perpendicular_vectors_worksheet.pdfIn PDF document text
    • http://darozux.epizy.com/boxing_star_apk_mod_1._2._1.pdfIn PDF document text
    • http://jozapatoxijoraw.epizy.com/8216533997.pdfIn PDF document text
    • http://kugilib.rf.gd/75225224864.pdfIn PDF document text
    • http://pokatutabojew.rf.gd/mipovifu.pdfIn PDF document text
    • http://kinowazekuponaw.rf.gd/varilavuvisejexena.pdfIn PDF document text
    • http://rajowezurub.rf.gd/maths_worksheet_for_grade_6.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 5372 bytes
SHA-256: b7c6a1141dd284a79934cce9944ce5fa41427bd56de030be02878494761f5867
font_01_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 11292 bytes
SHA-256: 6a7f3f21c96d97e28fe4119c136305fda975e9e362035a8f2c703eddf49b74a2