Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f438c0076fcf4e…

MALICIOUS

PDF

100.8 KB Created: 2021-03-19 04:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4ac27137fd49d83960008189274c9cf9 SHA-1: 33d2da19f9e6f8eeec9cc923545da72f554a186a SHA-256: e5f438c0076fcf4ef764a3481eb52f7e2687df6935d89ba10ffafe7ab78939b6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The embedded content, though heavily obfuscated, likely serves to direct users to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/123?utm_term=blog+templates+bootstrap+free PDF link annotation
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/wemetimowa_nomit.pdfIn PDF document text
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/5752175.pdfIn PDF document text
    • https://levivododusot.weebly.com/uploads/1/3/4/3/134307397/2066443.pdfIn PDF document text
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/8435252.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/kuvuji.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/1243bb9e-6c98-4145-9991-95d07da9574f/65776777488.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/golemerunupew.pdfIn PDF document text
    • http://getojigukas.epizy.com/50_shades_of_grey_netflix_country.pdfIn PDF document text
    • http://sanebofav.epizy.com/42979122248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9dd856a-d616-4d36-96f7-702ed55a01c0/how_to_fill_out_a_general_waiver_and_release_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14843d3a-a82b-43b7-878d-b24b48ab07d3/do_navy_get_weekends_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f599c6-d20f-41a8-8bfe-f66c89eb7a8d/how_to_find_slope_and_y_intercept_using_two_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4a67cd-ac07-40c3-866c-72c9da962aa6/oreck_xl_vacuum_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6380ec-e2b0-4dc2-9cf9-050bbdf193ea/bidilorupiseligenojowok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a036716-363f-4963-813f-f0dde329ce02/damisasidogemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b3822a-7318-4a6f-a827-ff70c6e87b73/87168919062.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/burubobukaloxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674c1494-58f8-463f-b969-8a9ef89216f6/conceptos_y_definiciones_de_la_investigacion_de_operaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/formal_presentation_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/easy_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/feeding_guidelines_for_one_year_old.pdfIn PDF document text
    • http://wewonak.rf.gd/brachial_plexus_block_ultrasound_guided.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_off0001491b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 5408 bytes
SHA-256: eb80b467330fbc5a0aa29e7af7e1a364d81f8bc959158870441923484d7da349
font_01_sfnt_off00015b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B67 11828 bytes
SHA-256: 6a7441d293a2b01c425f901c06a7500d68ee751b9656b79146f888e1a0f9ec7b