Malicious PDF — malware analysis report

Static analysis result for SHA-256 6164167516cc98dc…

MALICIOUS

PDF

85.7 KB Created: 2021-03-29 18:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 09b20e94e700a692df6d9b2dc846855d SHA-1: c26566d88675bec943941a82d82d256fc1ea5b17 SHA-256: 6164167516cc98dcc9856967995abc48888f364afcb63788f4656be290a39f58
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/award?keyword=aseptic+area+in+microbiology+pdf PDF link annotation
    • https://cdn.sqhk.co/pebekaja/hggchgO/welujevivubuxiwipetok.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/iEigQz5/gold_miner_undersea_2_player_hacked.pdfIn PDF document text
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/398274.pdfIn PDF document text
    • http://flylovel.com/how_to_use_serato_dj_lite_with_spotifyskrk1.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/fjfSjCG/realpolitiks_new_power_ps4_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/jupufopil/apiadgc/31059181143.pdfIn PDF document text
    • http://lesantyqas.online/wepenurajimazaziltfqn6.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hgih6c5/truck_driver_bhojpuri_movie_songs_free_download_mp3.pdfIn PDF document text
    • https://xetudutadoboja.weebly.com/uploads/1/3/4/3/134344850/8169397.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_7657adbad32e4271803344d9101cd9fa.pdf?index=trueIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_2c35fb283ff544898b1e505513b6d2f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/anthropology_optional_toppers_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/why_is_my_petrol_lawnmower_backfiring.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/fusif.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/trio_axs_tablet_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/6528987299.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_65bdd8d913584227bc96406040ad3733.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_df5219f188b244edb58401c2228ad1f3.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_6dcc01b9878341299f1daf0d1254774c.pdf?index=trueIn 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_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 1696 bytes
SHA-256: 2e3af33663d03ec9a00a2230504bb9e8f98e67bd55fe1d0bcc4ef3f4c4b957b0
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 5708 bytes
SHA-256: 47baeeeae3802ebaf650dc5004b6722934ff7f2f3ad5cf14d3c1fb7e6917400c
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 11308 bytes
SHA-256: 04b81acdf49bdd14d4a51ab88b23b07d43346766379b05a7280affda22bc3ef7