Malicious PDF — malware analysis report

Static analysis result for SHA-256 304e25a888131fa3…

MALICIOUS

PDF

80.4 KB Created: 2021-04-01 19:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 654cb1ad8b02bbf58792dd9d0ff5e269 SHA-1: 08165964b12c6c8d9e1260215316b8f402a3069f SHA-256: 304e25a888131fa3b1e032cfcdd738d06b55d7e446d73ae7060c8444d0d8a7c9
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is likely used to lure users to a malicious site. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within the document body is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=settings+of+social+case+work In PDF document text
    • https://cdn.sqhk.co/nokulebepoba/ji1Zge2/totugawizegolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_601f9d0f77fc0.pdfIn PDF document text
    • http://afracheat7.xyz/vutosototogzthse.pdfIn PDF document text
    • http://vizionsmc.net/vujazipogadobqpubc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fef0a825f796.pdfIn PDF document text
    • http://videohost.space/tumudujuxuxxtu8v.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/fYghrid/jexuzojuduwatefimowoju.pdfIn PDF document text
    • http://ekzo-fruit.ru/pokemon_soul_silver_egglocke_downloafu5ar.pdfIn PDF document text
    • http://return-0.com/privacy_and_publicity_beatriz_colominaajsi4.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/bill_of_sale_florida_form.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://uploads.strikinglycdn.com/files/644bf042-5b9e-4954-88a9-384685fc55b9/tezobazoxuwovowasuta.pdfIn PDF document text
    • http://sulorunak.rf.gd/le_texte_du_trait_de_versailles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b612382-4284-48b1-b742-f073984e2f2f/ncees_fe_reference_handbook.pdfIn PDF document text
    • http://durozebexonadop.rf.gd/35806678477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0a7f2d-3274-4c29-a0ee-7917f22d2c8f/in_what_type_of_plate_boundary_did_subduction_occur.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/what_is_the_primary_goal_of_management_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/6082864457.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/programa_para_unir_gratis_online.pdfIn PDF document text
    • http://weverikovufom.rf.gd/estimation_and_costing_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/xilaf.pdfIn PDF document text
    • http://wenuwobowikowax.rf.gd/honda_generator_3000_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/abc_matching_sheets.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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5096 bytes
SHA-256: 71b9aa3fe916ed34a438be463eb8fe530a1db8b94b300277043f2ae9a5c7b26b
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 10408 bytes
SHA-256: 902e3754c72e37570dc21019ff1edf6121222051b087fa039f8e1bb97f27ae0d
font_02_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e