Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94a9e53eca95193…

MALICIOUS

PDF

80.6 KB Created: 2021-05-31 21:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c92eb29edbb3a595728751fd820d5ae SHA-1: d6d0dfb0f7871de913a2403a73f4e5ff277c7ca6 SHA-256: a94a9e53eca9519373b472988eed84e555ead07dad274bce7f1466168ab30e42
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 0.9998

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://xajibur.ru/123?utm_term=virtual+instrumentation+books+free++pdf PDF link annotation
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/neroxajago-vowazokapijalig-xuladorasigir.pdfIn PDF document text
    • https://xasazixasemopib.weebly.com/uploads/1/3/4/3/134306387/690785.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/8314366.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/2224524.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/4882d2553.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/5d3f42a0-d88c-469d-b3dd-4ba0928f3fd5/how_to_restart_my_fitbit_versa_lite.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/43284841381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8e4c9e-cc3f-4870-866d-f5c1bf012b4f/how_to_clear_acne_scars_on_face_home_remedies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da195557-ab64-4c60-85b5-c75662936bec/gopatadusodananizomaxuta.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411441/how_to_write_a_break_even_analysis.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/fixegozibug.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144423369/bekhayali_song_free_download_kabir_singh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119ba494-0a33-4aa4-abd4-4848613f3c5c/mifonogewuzojugimi.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412215/adobe_photoshop_classroom_in_a_book_2021_release_download.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144420459/51806729983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cd4aec-f825-43b0-8057-e5273656f63b/acido_clorhidrico_mas_zinc_formula.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://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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 5356 bytes
SHA-256: 4bf1f4564efd9bc7e04c40cac8a72f25b9818b7c6e0fe2f8cb59e88ad82ef03d
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 11752 bytes
SHA-256: 4b1a268096519bca59040315fc7efeddcff664ca139b32ade2798b2805f1878f
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667