Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f719799572dc4…

MALICIOUS

PDF

151.9 KB Created: 2021-03-10 11:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 79a0a5fb63e83e857d2e1c28409b51d6 SHA-1: f4b390cd215fd96f426bcbdf851f076a1c2d48ee SHA-256: c84f719799572dc44fc3ec0ce6d689b4d643d3535cab96db87f978feed9bec33
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/aws?utm_term=digidesign+003+driver+high+sierra PDF link annotation
    • http://sportita.fun/my_singer_simple_sewing_machine_keeps_jammingsb2t6.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/xixotafubakale.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/1285537.pdfIn PDF document text
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/xufobivul-jofitufiwupov.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/ncc_c_paper.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/3978480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_60167b6b5cedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_603bcf8d6529f.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/windows_10_enterprise_version_1703_updatev7kzm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_601d6efc51017.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/9314372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fd1d2506c4b1.pdfIn PDF document text
    • http://oneplusonemain.xyz/60181074162e1po9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407756/normal_5fcb70aae51c4.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/5c075a28-599e-4824-acc8-148ef4d97b74/xuzofevixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013f4b9e-4a0c-493e-b5c4-6b7bf8ad9fc5/94100591209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86072c91-2871-464c-b7b2-cc1aa97c6e10/mikegaruxolepovepokadezux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288df620-7c67-41e3-a933-feb8cded5ceb/what_is_teaching_english_as_a_second_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fe54d5-01ab-4b2a-b5db-81bbe7397c2f/20428342027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be64700b-74a4-4375-9a46-0c44b79c38d6/43781118125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c244db-082a-4953-9e9b-83ffd83322df/how_to_install_kangen_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50dbc270-27b9-4599-a6fb-6defec4ac98a/3926931808.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/mezoxumos.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_off00021002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21002 5420 bytes
SHA-256: c628dafd7dd84e1a990fe8db32480020862f01fe6a28b50785b0b37acf393a0f
font_01_sfnt_off0002227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2227B 14316 bytes
SHA-256: ac1681aae3d50aeca81fa61d8edaf17be8a4be7b99737e6a3bd0ed0999643f8c