Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bf189c489c6e9c…

MALICIOUS

PDF

120.9 KB Created: 2021-03-24 15:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: da621753c0f3ca671e03986e219d1e28 SHA-1: 7386bf7bd05b4c6349a57b4e320935da38d0abd7 SHA-256: a3bf189c489c6e9cf1eacfa241e4e7e727a58cb3fdcf7c1f0c06f70319b936f2
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or unknown reputation domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using link farms for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=naruto+shippuden+online+sin+relleno PDF link annotation
    • http://gepexoliv.medianewsonline.com/brother_mfc-9970cdw_printer_driver.pdfIn PDF document text
    • http://salleapp.xyz/how_to_make_a_kitten_friends_with_a_dogf4uod.pdfIn PDF document text
    • http://gumoximowukowot.iblogger.org/attachment_style_inventory.pdfIn PDF document text
    • http://nofipozi.22web.org/e_waste_management_rules.pdfIn PDF document text
    • http://kevufeduwatawos.mypressonline.com/vukexowu.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/dokotediwuzabo.pdfIn PDF document text
    • http://cmbmarketing.agency/kindergarten_coloring_sheets_back_to_schoolpp7c8.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/the_bloody_chamber_setting_quotes.pdfIn PDF document text
    • http://jagidevivuvu.22web.org/balabakobow.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/how_to_program_4_button_liftmaster_remote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_b1a6e12d1f7e47c18d8f76cbc71a728f.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_05160842085842fc8a559ee6011adad8.pdf?index=trueIn PDF document text
    • http://worifazitinel.rf.gd/wpf_tutorial_c_corner.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_ecbb6e3938004d65ab14fbc1f63273ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5a608b-93b4-4712-83fc-3650461bd4ad/fasodul.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/aptitude_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39aadae-cc24-4ce4-bd82-ba3d836aa43b/how_to_quit_smoking_book_by_allen_carr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649dacd4-c544-4039-af24-3a5495c6c0c1/r_markdown_basics.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001765d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765D 6812 bytes
SHA-256: 2e0ee37cd64f4c35472631c058407906ad20f0781d2500579fe3f45af03c2431
font_01_sfnt_off00018794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18794 5016 bytes
SHA-256: 1fd47101ade08d0aa9f21e207489001f2309383287d3112d044c5965e607bf32
font_02_sfnt_off000198a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A2 12440 bytes
SHA-256: 955c38242506dfe9ff011f23537f283f3a7fd0298af1fd934fd03e05e77b14e2
font_03_sfnt_off0001c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C104 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d