Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d166ab167feb87e…

MALICIOUS

PDF

98.1 KB Created: 2021-03-14 12:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 81ba89c47832d1c7efc8390361cd0c3e SHA-1: 5c4f1b3d4f1243b371928fb1653ad7942d7fbbf3 SHA-256: 5d166ab167feb87e1fecff49fa96c4758161082304739cc830b6360f43c5d4f5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. One prominent URL, 'https://soxebez.ru/strik?utm_term=h81m-p33+v2+drivers', appears to be a lure for driver updates. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://soxebez.ru/strik?utm_term=h81m-p33+v2+drivers PDF link annotation
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/216229.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/b5iiLhH/11214215005.pdfIn PDF document text
    • https://jasemoluzisad.weebly.com/uploads/1/3/5/9/135968146/texupurewu.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/ihj6Dhj/rukepusubufejodilisebed.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/fjbhjgj/mawixutejof.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/ferimap-nebapezubeleda.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/9c4eead.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/nseLieM/nick_chubb_total_rushing_yards.pdfIn PDF document text
    • https://tavurusifuta.weebly.com/uploads/1/3/0/7/130740255/d4c28c04840e8e.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/eXr2Qf6/37096418249.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/e271f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cc733b74-4fc3-4a4b-97df-6c5e14cb1aca/how_long_to_become_ob_gyn_nurse.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/51958262601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f8c70d-2550-4aa6-a665-cb52ac60b3e9/aruze_slot_machine_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/tajugefokidigawemigidazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6764b991-014b-47db-b436-0e773d1f7f05/how_to_outline_a_plot_for_a_short_story.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/wamujotegumesar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0d17df-f11b-4855-bc7e-865ff5cef9f4/gesefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab157d19-4420-4e61-aad0-12f2ecf7fd0c/74456626351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e6eeb0-c436-406d-87d3-04744545dfac/rulitajenunisimufifojanes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087ee6fd-b074-497a-bc79-20cfc7cd1711/69535079627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3849c6-2b89-4688-bdfc-f97815f5a02b/what_to_name_my_dance_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df6dd07-d931-4bca-8b9d-7c9f92b88993/rababukopavowawazup.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/lake_camanche_bass_fishing_report.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5248 bytes
SHA-256: dbc0a494fae2dcd6ba0e8e9702476d1dfd0b7f36f40be53bedb0f09124501dbc
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 4952 bytes
SHA-256: 1f2adec7ac3f2e44d327555722221c0d49378f3798aa94e0a131acfe7ea23835
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 6792 bytes
SHA-256: 6bc990754ca30ecb610bb06f139ceb4e3d24d45a22a74670c878d11334cae616
font_03_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 14728 bytes
SHA-256: a42dc9ca2414ad0357157bb0a0f9c93ac5cb63ba8173782c0d9e24fcf2804c81
font_04_sfnt_off00015321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15321 17044 bytes
SHA-256: e3831609e2aae67e411b7a7245f2fe7d9248d2e0a484ac09b83242bfd53ebfe2
font_05_sfnt_off00016b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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