Malicious PDF — malware analysis report

Static analysis result for SHA-256 218d1323e8386bf6…

MALICIOUS

PDF

105.6 KB Created: 2021-03-29 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e890d4ebf5ef9303a3024e5f4eaf788 SHA-1: 3acaa725ba8ab088d6f249bd945044f8625e8803 SHA-256: 218d1323e8386bf66c5ab89a6064e6e55d1e82d262d1cdfe198eed02981c2e8f
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 0.9994

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 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://baarspo.ru/wix?keyword=eyewitness+rocks+and+minerals+worksheet+answers PDF link annotation
    • http://pumba-timon.space/grade_1_math_released_test_questionsfekm4.pdfIn PDF document text
    • http://worldhold.online/lavatofevujefovegivejw8lhz.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/6e8a449.pdfIn PDF document text
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/vevupo_muwudipiguri_banuxawuxerogel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_601dbe220929d.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/cdl_practice_test_ny.pdfIn PDF document text
    • http://stepka2016.xyz/85834918850aa4j2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_6059d066cfcad.pdfIn PDF document text
    • http://geesecam.com/what_are_the_five_major_rivers_in_new_mexicobwpua.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/27215813688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_605be40e9747e.pdfIn PDF document text
    • https://mezamelakinates.weebly.com/uploads/1/3/5/3/135304028/maruxo.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/dopib_vakuk_donubabox_relufizotite.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/7b6fa86a-4a36-498d-8029-2877cc6a528d/what_is_a_meta_analysis_vs_systematic_review.pdfIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_bb2f9b3102324d5380eda308a9eb7729.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_29960102bbec426cb71e512ff3456c8a.pdf?index=trueIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_ff3f2a3111024667a56e560e8c24bece.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9011c7-d729-4efe-9ad6-242156630cb6/dagunosefovidolusur.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_6875b60f44644c41a5e208a340b5f9a7.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_d6f4bb97f6e94948967e3717b4be71f0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 5392 bytes
SHA-256: 446c4107b62851c07e55a7b1c806ad47fb3e5571e811dd53f47f90b8af9e2d16
font_01_sfnt_off00015a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4E 12008 bytes
SHA-256: 35cf1665cc47100c11557292ba4c2449d2031573911a8e31fb1b46886eb050f8
font_02_sfnt_off000182d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D8 16140 bytes
SHA-256: 00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107