Malicious PDF — malware analysis report

Static analysis result for SHA-256 255e38df8c7cb28f…

MALICIOUS

PDF

89.4 KB Created: 2021-03-30 00:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82c0687d0ba40d78cebb991f806ce314 SHA-1: 9bac0f2bb3f28b221532d213b172283560aee1a5 SHA-256: 255e38df8c7cb28f2328f88278b7bac02380eb68940a05080d0fced2cea7839d
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 0.9995

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://resalured.ru/strik?utm_term=is+it+illegal+to+break+a+contract PDF link annotation
    • http://povar2020.site/modifujuxerojebupetfbvd.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/tratamiento_sinusitis_aguda_adultos.pdfIn PDF document text
    • http://presalle.xyz/d-link_dir-615_b2_firmwarex0a94.pdfIn PDF document text
    • http://pesuzukotejoki.iblogger.org/60095533118.pdfIn PDF document text
    • http://boothattendant.com/dusajejirode0ivuv.pdfIn PDF document text
    • http://everydayy.fun/verseview_bible_software_free_for_pc3x6wi.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/47665854456.pdfIn PDF document text
    • http://aires.fun/percy_jackson_characters_birthdaysof49p.pdfIn PDF document text
    • http://thecet.xyz/warlock_5e_hexblade_guideoo5dx.pdfIn PDF document text
    • http://runmasten.online/asp.net_vb_tutorial_for_beginners_with_examplesws30l.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/zktime._net_3._0_attendance_management_software.pdfIn PDF document text
    • http://options.expert/who_are_lucifers_siblings_in_the_biblehee3m.pdfIn PDF document text
    • http://youtube-subscribes.com/birutovaruwimo16p1m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mofemofosaxi.rf.gd/abstract_algebra_3rd_edition_by_dummit_and_foote.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/bushnell_scout_1000_arc_instructions.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/ancillary_justice_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/what_size_dolls_for_kidkraft_dollhouse.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/84041723406.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/davenen_sheet_music.pdfIn PDF document text
    • http://birifamabaxum.rf.gd/fonozunuwekalaxatomake.pdfIn PDF document text
    • http://livuladebugalab.rf.gd/disgaea_dark_assembly_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 3304 bytes
SHA-256: 0eee0c717c3fd98372df3d2c2f281b74e80190b34768fce79aa1701b8120bcef
font_01_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 5108 bytes
SHA-256: e7a41223b3ffecc1744c1718c67d496d548be1651eb846e1a0df8e8ea1be099a
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 11524 bytes
SHA-256: e3329e7f82f41469e60f1dd811ca3a047b244a146f482ebd07fc806b3930508d