Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5141bc0ac760fc2…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 05:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 21b56f874861a6087f7564beee37ec63 SHA-1: 74dfe729f281442c2de8cc2b6cca4865ad8e0956 SHA-256: a5141bc0ac760fc26b4bc86d17a1a784928a35dc25fd40ab0b21b244a903f43b
134 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 and presents a deceptive download button. 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-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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=general+training+ielts+reading+samples+pdf+with+answers PDF link annotation
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/5a320b500.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/levixupafep.pdfIn PDF document text
    • https://wutomafokusax.weebly.com/uploads/1/3/5/3/135314756/66f3fc2d66db.pdfIn PDF document text
    • https://pawapuso.weebly.com/uploads/1/3/4/3/134312868/4cef1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_605ee61181f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/jiijjeq/world_bowls_championship_prize_money_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fc5af0482868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60115f271c0bb.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/house_blueprint_sample.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/breath_of_fire_4_walkthrough_download.pdfIn PDF document text
    • https://rutarutan.weebly.com/uploads/1/3/5/2/135294158/1b218c6b7c5.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/bhagavad_gita_in_telugu_book.pdfIn PDF document text
    • http://jezonikiroka.mygamesonline.org/breastfeeding_diet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_604ee6a718e3a.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/pebble_watch_strap_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/thjiegh/dutipir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdddeafb-f990-49fb-8466-ec3c11b0ff1b/how_to_reset_pantum_toner_chip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b40aa2-f1e0-4c7f-9972-5f8dd36829d8/36005326270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cabf16f-403b-46fa-827e-4fef40beed31/34336424081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7713d5b4-9a7b-45f8-b570-69eed01a1796/how_to_setup_netgear_ac1750_wifi_cable_modem_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e542e5b-c5b3-496c-9f6a-5fccf702033f/what_is_the_healthiest_frozen_dinners.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5576 bytes
SHA-256: a76efa255f86d54370eafc83cd167119f29e0674c494d7ee02d8cfaa53b131d5
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10708 bytes
SHA-256: 691d12e0f8b6a37dc17889f5547b192f2a495373cfa7bee0551e675c177d4b24