Malicious PDF — malware analysis report

Static analysis result for SHA-256 f957d533a0d29284…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 17:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 10f0ee78cce93fd550529f849210943b SHA-1: 23874896a7ce6f1808b7d72e370ebc7712bbaddf SHA-256: f957d533a0d29284121d8d8821cf0372d25bd0b6916a1f9a6366aee1e5bc8a3d
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute further malicious content or phish for credentials. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=basic+technical+mathematics+with+calculus+si+version In PDF document text
    • http://bawazofo.getenjoyment.net/jexirorejumagar.pdfIn PDF document text
    • http://tesocoin.online/fojijawodesuravasiludcxibi.pdfIn PDF document text
    • http://keto-s1.com/bible_commentary_online_strongsk3jp4.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/noxom.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/educacion_en_alimentacion_y_nutricion_libro.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/states_of_matter_worksheet_grade_5.pdfIn PDF document text
    • https://bisuduroj.weebly.com/uploads/1/3/4/7/134714880/kafado.pdfIn PDF document text
    • https://tapevasazizile.weebly.com/uploads/1/3/1/4/131454670/a5738f15fb20c.pdfIn PDF document text
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/kojemuriwirere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwewugewu.atwebpages.com/19459745129.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/vipaniv.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/irrevocable_trust_document_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b1c8b2-cf88-41ae-9aeb-005b5d6ef3b9/excel_spreadsheet_templates_for_tracking_expenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1c55de-57ce-4e99-9f09-94aef9b9e926/60808097597.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/wuvukorimavikitipojuriz.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/53643298794.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/89227962156.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/application_form_for_passport_card.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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5240 bytes
SHA-256: aba4cf4a8ac76ad76d18a17bfc200321bf974a96485ff8536c60c93ce1974720
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 11084 bytes
SHA-256: 11737aceb0877c0e9d981e0a9907cba9d40119af8766130d7a37872fd48e40d9

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