Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c03f2d7bbef6a8…

MALICIOUS

PDF

80.1 KB Created: 2021-03-23 20:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5164413500e8a8133ee0f524d57d9ebd SHA-1: c64bd6a3d0ab9c3cf679886343d8b010c6ce4078 SHA-256: 52c03f2d7bbef6a80b7472444cb72f217ab5a2227e386587b5b799a854bd2707
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=precio+libro+harry+potter+y+la+camara+secreta PDF link annotation
    • http://devgm.design/fokideguby7g1.pdfIn PDF document text
    • http://proba7.xyz/the_rime_of_the_ancient_mariner_part_5x6asp.pdfIn PDF document text
    • http://crystal-light33.ru/customary_units_of_weight_worksheetsqxqgs.pdfIn PDF document text
    • http://sibuvre.com/13869709657sbmmx.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/7904395251912fqr.pdfIn PDF document text
    • http://shortsomfj.space/logitech_mk710_wireless_keyboard_setupsw76b.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/circuit_switching_notes.pdfIn PDF document text
    • http://axacheat4.xyz/48338419952gi8g8.pdfIn PDF document text
    • http://cyberlife.store/the_valley_of_horses_audiobookai122.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/trastornos_alimenticios_en_nios_y_adolescentes.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/49040729935.pdfIn PDF document text
    • http://verifiedbadges-form.com/what_are_good_video_games_for_11_year_oldsqvp2b.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/download_kakaostory_apk_for_pc075q9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dopovis.myartsonline.com/wesapudofoban.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_38bcc41954684813a02a79a1b12ba0eb.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_4afa66c4631b40d3a5f747629fa31fbd.pdf?index=trueIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_b812bdb010cd41b496df66e1b3b96a15.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_64f02f8ee29c4ee684d72de82f77b1c9.pdf?index=trueIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/jumupowajev.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_bba1335959704d39a1113d9a598a67a0.pdf?index=trueIn PDF document text
    • http://liraperuwuw.atwebpages.com/9102624498.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 5096 bytes
SHA-256: 2b45a121f189eae9cc7c2966b0d2f77c36d6af6efb94ced4a858195bc691d77f
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 12216 bytes
SHA-256: fd4367939f6dbd96d547c5ba70297f9f8d651fa20cddf438e14f69415a217020
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d
font_03_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378