Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5a3496ecfb4ffc…

MALICIOUS

PDF

76.4 KB Created: 2021-06-14 23:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a0466d833cc40d4dd5f400e633e5627 SHA-1: 0be5fa326e65e1eb1ad87400161a15ce3ed77f6c SHA-256: 3f5a3496ecfb4ffce870df2da90629fc4f743b6b5fa1d325120ec3fdd681691f
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one prominent URL suggesting a lure for a free download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pixomot.ru/pbw?utm_term=carter+4+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486197/normal_601475726fb08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fca7d2ea4930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6031bec70098e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_60c629a5b6fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_60355136628af.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/70c62e5a-46bc-42c7-adf0-146805642270/how_much_is_a_paypal_cash_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b39f67-9dda-4a45-9695-2b193f706221/14264434436.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/bitezarexazup.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144479334/wobisinanijafox.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144940335/levitimosutabolir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3a01b5-e6fd-47b0-8b4e-6a0e0df63fcf/35998622990.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/72054608117.pdfIn PDF document text
    • http://bugedavamib.pbworks.com/f/advanced_reading_passages.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/145231353/tarot_major_arcana_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf7e14d-17eb-4b68-80cb-c23e7ffab890/articles_worksheets_for_1st_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e7058d-714b-43c9-b404-01b36ab69a6a/kolejivafijemefawimolu.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/chatbooks_app_crashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3834278-9a8d-41f8-b123-fea5affdd47b/76890631476.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/download_subtitle_john_wick_2.pdfIn PDF document text
    • http://kopixikosibi.pbworks.com/w/file/fetch/144729888/foxino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349206d9-dde3-4395-aa05-a7f2c6550c3d/sasodavefo.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144713079/how_to_load_paper_in_sharp_el-1801v.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/zitometi.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/f/patanudukaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc168db-8ef3-4849-882f-8240150b466a/what_instrument_is_used_to_measure_surface_finish.pdfIn PDF document text
    • http://fesatisobif.pbworks.com/f/1200_words_for_ielts_listening.pdfIn PDF document text
    • http://jekijuv.pbworks.com/w/file/fetch/145239945/ios_apk_app_store.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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 4808 bytes
SHA-256: bba301edb4ec9281f47c609107eaf673d7a4cefbc3173193ef5f9ebcde0c731c
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 10548 bytes
SHA-256: e41f990869987c5fee57a5d1954eda5bf9e0e00be0cd988be260448fbc73fc78