Malicious PDF — malware analysis report

Static analysis result for SHA-256 445cf366bb82e8d7…

MALICIOUS

PDF

111.3 KB Created: 2021-03-27 10:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ac2a7fbc96c9dcbb1d700d6836b067f9 SHA-1: 0c118d3ded99fefd67b1acfbfb3a42c744b75549 SHA-256: 445cf366bb82e8d7c123f53c88c559f8c11de9d2bc6195631c05d105a666f896
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'bovine spongiform encephalopathy' which is likely a lure to entice users to click the malicious link. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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/123?utm_term=what+is+bovine+spongiform+encephalopathy In PDF document text
    • http://nibewubixela.getenjoyment.net/variable_frequency_drive_theory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_60094dc51d768.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/dapepofol.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/motorola_xpr_3500e.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/cjgjggH/hasbro_star_wars_studio_fx_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/jdgegdc/53879481350.pdfIn PDF document text
    • http://nogixif.iblogger.org/garmin_vivofit_2_bands_original.pdfIn PDF document text
    • http://vavolezabogisop.iblogger.org/size_of_a_ford_ranger_truck_bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_603e856301dd5.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/iigiggW/wasabadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solarujarinobo.myartsonline.com/15264064936.pdfIn PDF document text
    • http://rotitow.rf.gd/90783601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c898739e-c453-48f9-b21d-b6738406464f/felosudenonumesuv.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/mulipu.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/mathematical_symbols_and_their_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb5cecd-a990-4ed5-a8a0-498b2c58814c/23472788809.pdfIn PDF document text
    • http://papujov.epizy.com/lowrance_elite_7_chirp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd339f5-f18a-4e0c-90a8-dbef432310d3/4-week_mediterranean_diet_menu_plan_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2d6a6a-1af1-4c88-bb72-447e869fab79/76036098381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e8aad5-1f86-4d85-875a-d60637926105/62341461800.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/ferojozujawinokobob.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_off000174ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EE 5744 bytes
SHA-256: 3043961e283bc0395dbeaeb528362efa751b6dc84eeb7d3b5c0bbbe2693882c2
font_01_sfnt_off00018877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18877 11744 bytes
SHA-256: c99d61a894616bbe7765c1c0fd78b34ca7e8f8dde8ff27e0f9f3700b96b220b8

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