Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b28a411a0e8ae4…

MALICIOUS

PDF

81.6 KB Created: 2021-03-13 16:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8db4bcb2f4adb27b2a38377aef9e5b41 SHA-1: 9cff3f0024d6dd4aea02795a544f2e9e3e0b7431 SHA-256: 04b28a411a0e8ae499adb143bafd8bfff763fdaa3691263540ea69385dd2baa9
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 0.9997

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://resalured.ru/aws?utm_term=real+world+range+of+tesla+model+3+long+range PDF link annotation
    • http://dusibarupuguli.medianewsonline.com/how_to_do_regression_analysis_statistics.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/97391330875.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/tefimedarodalilop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_3feaa868e548486c97797026287cf3cc.pdf?index=trueIn PDF document text
    • http://pogetowem.onlinewebshop.net/nurumanawijevesezefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50387b40-d37e-44d7-8ed4-8d0b0f52a037/star_wars_rebels_black_series_ahsoka_tano_figure_stores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff43f9d-4af4-4c18-9512-4f09d29630c7/how_to_use_photoshop_cc_2015.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_f5067e1eba6246daad6b55f0a0857478.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd55b34-ec61-4729-bf14-5fcc3397b8fa/logisaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f513e7cf-a774-44d6-84af-9d09d177f0b4/usmle_step_1_percentile_2020.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_8c6ef91d88a84bf68975dcbbbef9a24b.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_a03ed8a6cd7044ca982039891dba677c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df7331-ae72-4e3e-b973-b870f663fdf2/double_dapple_piebald_dachshund_for_sale.pdfIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_11b4dfd1f99640ce9db075ceea9454c4.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_50478b95bb30490a9d68ff05abb523a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eca5f1e-9f90-46dd-9e77-1436e93b5b6c/35184271917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320b648a-01c1-4afc-9da8-afa127b2fe1c/lexusuvefevefizijarafil.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_c10a8081277c4d9290a9ee45f52df804.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/287076d8-a5d1-41ef-add0-e87118beaa29/guitar_theory_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0a2b94-448f-4de5-8752-94d771b1f32f/82770389192.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5228 bytes
SHA-256: 7caf93f693fe8ef1566e00e611f0823b173300e98d2d2aa03ab38b5f38cc2d73
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 11312 bytes
SHA-256: 3b2e597cfc5567029ffb4a456dd35cb7c2ace3173d94fc0de1dde29a37ba7435
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378