Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1d424a0424444a…

MALICIOUS

PDF

76.5 KB Created: 2021-04-30 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 547d7282cc428881d188b5ad00f060a2 SHA-1: 7de286238654bb481c36370a59aef43913132754 SHA-256: 2a1d424a0424444a25ae8c4e9d7dcb60caefe24c801961fa9583697007f46dad
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farm heuristics, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

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
  • 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://midufefew.ru/strik?utm_term=a+sand+county+almanac+chapter+summary+the+land+ethic PDF link annotation
    • http://zorigan.22web.org/budapest_map_free_download.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/b7e715.pdfIn PDF document text
    • http://tajavimisafom.22web.org/english_for_aviation_practice_test_2.pdfIn PDF document text
    • https://xovotirepotu.weebly.com/uploads/1/3/1/4/131412955/torip.pdfIn PDF document text
    • http://liko-sneakers.com/52889776829vry0j.pdfIn PDF document text
    • https://lepudumewo.weebly.com/uploads/1/3/5/9/135962044/daf72.pdfIn PDF document text
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/pesoger.pdfIn PDF document text
    • http://marketes.pro/area_calculation_for_different_shapes194a8.pdfIn PDF document text
    • http://bujufamamaw.22web.org/niwupifaxelukaketoderu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusixa/37453049512.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/what_is_a_good_score_on_your_sat_essay.pdfIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_71d725369dd34678ba05a5f01b7bd9e6.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/warivasitavu.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_6ced0ebf80514d06ba8813e87d7f1830.pdf?index=trueIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_41b71d3bd72b4f598251d737bcaeb418.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_a151025bb5764ad4b5250873cdbef36d.pdf?index=trueIn PDF document text
    • http://lodusebivepakef.epizy.com/hotel_brochure_sample.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/assam_tet_book_english.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_588d5bff87764942817076f17c2f0a1d.pdf?index=trueIn 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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5404 bytes
SHA-256: 9876215541c3e6bc129207d13b8efc600acb0c4814cee57728f073c85cdabccc
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10500 bytes
SHA-256: 389c5452dea712fb45ded518f211b36fbb7f73f015b9cbb993a536c6698e96aa

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