Malicious PDF — malware analysis report

Static analysis result for SHA-256 b542b4a615fc4bd6…

MALICIOUS

PDF

73.0 KB Created: 2021-03-19 06:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebabf36a15b39a74db3ac1c0bf90bb77 SHA-1: b65d80e4447148ce86e0512af33bd5aee46c2ae9 SHA-256: b542b4a615fc4bd6ed8a543e0160416489a4926cecd1b1a7b28513951ee8abce
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of embedded URLs suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=code+formatter+online+python
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/rimobil.pdf
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/tijogupemulagoni.pdf
    • https://cdn.sqhk.co/pinuwinepasu/eQd6gdf/kejimeg.pdf
    • https://cdn.sqhk.co/bexefoboxevi/hibWw63/64757058944.pdf
    • https://cdn.sqhk.co/febenanedibu/T0lu7gg/division_indices_worksheets.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/luwesobixo-siniderofoki.pdf
    • http://vir-tus.com/wigoduminazirn1vzv.pdf
    • http://vienvozvrat.site/dijotiwixujamu1ns92.pdf
    • http://coolstudent.space/spirit_level_app_apkbtz91.pdf
    • http://3-bureaureport.info/what_is_honda_odyssey_transmission_fluidk33dv.pdf
    • http://odemebayisitrafik.com/pilawewijugojokgc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mubefula/barrows_gloves_spreadsheet.pdf
    • https://uploads.strikinglycdn.com/files/a193253a-666e-4af6-a06f-8e5ff36aca1f/8363226461.pdf
    • https://uploads.strikinglycdn.com/files/82d741a8-1b34-4e35-8411-08699001721b/57618395765.pdf
    • https://uploads.strikinglycdn.com/files/ce6bbe6f-4c30-49b2-a3c3-21d27d36bdc7/how_to_set_up_in_ground_dog_fence.pdf
    • https://uploads.strikinglycdn.com/files/a04c30ea-e1a8-497e-9d08-d50a7afc5280/80654853185.pdf
    • https://s3.amazonaws.com/donake/21209916747.pdf
    • https://uploads.strikinglycdn.com/files/7fb09524-65e0-40c5-a5be-738ae1e27e52/lusuwibazaladojede.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e150.bin
58bf43a9ea6b45b4d898d291307fa24f2616f22e28725598185ea72b63126c91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 5112 bytes
font_01_sfnt_off0000f288.bin
12185ebad52d419992e0b2dcae0fae8c13b15dc24d9e8fe8b7aead8f60a39fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10780 bytes