Malicious PDF — malware analysis report

Static analysis result for SHA-256 6759dd8fec9fea86…

MALICIOUS

PDF

94.2 KB Created: 2021-02-15 20:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82187b406194f3e1ac2d49402c79b22b SHA-1: 1ad5f7ea3d95bab7cddd14231e32fe5acced6c17 SHA-256: 6759dd8fec9fea86b17e0fe95afc257cc0a0170e7c9fbf48cc7038835692e557
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic specifically flags a link to 'yafferge.ru' as malicious.

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://yafferge.ru/wix?keyword=types+of+selection+evolution+worksheet In PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/cf978.pdfIn PDF document text
    • http://yozi.store/27890016922poo4i.pdfIn PDF document text
    • http://13millions.store/90631860175jsbu6.pdfIn PDF document text
    • https://nerolokem.weebly.com/uploads/1/3/5/3/135326062/dff22ca1c41ded.pdfIn PDF document text
    • https://ruwawowek.weebly.com/uploads/1/3/2/7/132712040/mefamabo.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/samepupafetili.pdfIn PDF document text
    • http://cupe1.ru/26637460732pihvm.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/65425742257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_600b4a953da95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5ff508e67e5ca.pdfIn PDF document text
    • http://greatholl.com/instant_academic_skillsvt0p8.pdfIn PDF document text
    • http://zeraseb.66ghz.com/13199038968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwurebo.rf.gd/sasobetubezofa.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/indesign_application_template.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/free_online_cover_letter_templates.pdfIn PDF document text
    • http://jekabuwof.rf.gd/zodamupifemumazatajupe.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/drawing_simple_electrical_circuits_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/project_maintenance_plan_template.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_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 5160 bytes
SHA-256: 16f55b65470ede57311a01eb601db8f9a964df4e46835a2ec7bafeec40225a86
font_01_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 17192 bytes
SHA-256: 69f248eb18cc573124b36edba481f589601b2abba2644f2092c38607ca207f70
font_02_sfnt_off000152c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C1 16388 bytes
SHA-256: 2875da4d8b2a00587f0456c49b18d1c3746697dc25b6346c303d145c765d3ded

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