Malicious PDF — malware analysis report

Static analysis result for SHA-256 86baec342106d953…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 03:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ec4ba6c32cf44d10dd69e221f60675f SHA-1: db167ba065e0fa66fea83ac893798b2899ac3155 SHA-256: 86baec342106d953b010e9ac2d3af069b027e348378ee8c01a8a02e53f622f34
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of links and the overall heuristic firings suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=samsung+un55d6000+factory+reset In PDF document text
    • http://finoginujowiwi.mypressonline.com/61075502867.pdfIn PDF document text
    • http://milofaguwok.iblogger.org/level_1_antiterrorism_training_test_answers.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/addition_and_subtraction_of_algebraic_fractions_calculator.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/how_to_adjust_a_poulan_chainsaw_carburetor.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/shark_rotator_lift_away.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/barizabijodiv.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/kC9ghp2/caption_for_saree_pics_on_instagram.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/most_important_topics_in_physics_for_jee.pdfIn PDF document text
    • http://lewulumotuf.iblogger.org/87018703175.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/77162298748.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/Dhgifif/ax_3_domaines_neige.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/2738c6bb-a1b5-40cf-a192-d95e00259e71/what_are_good_words_that_start_with_t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7bd2d9-494f-435d-baec-71896ec4338d/shark_navigator_lift_away_deluxe_hose_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7928a0c-1193-479a-b8ff-73a24d84420f/jegonuxenure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebcde7e-0054-40e2-8312-1cc7b758c122/how_to_create_an_ecommerce_website_with_wordpress_online_store_-_2019_new.pdfIn PDF document text
    • http://natelizijiliti.rf.gd/hermit_crab_care_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5936 bytes
SHA-256: 3f1cb21d5a676fe7bdff6c55adeb6d0bf05e8d302dfef6c0c1833bdf4909e04c
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10384 bytes
SHA-256: 0c8fcc8d979072c043a3da7b67e3a9b993f55e3187ba41eae4970b49f6f7bdba

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