Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5eea2b9e47691f…

MALICIOUS

PDF

72.6 KB Created: 2021-10-01 04:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bef08a44d5781acd3451a841a683134b SHA-1: ba375c34128b023fc5fa5703b3b71c8f4e0333ba SHA-256: 9f5eea2b9e47691f85f7239820956ddaf30c90a8a7da0e915bdab874746852a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to external sites, and one heuristic specifically identifies it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's used to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://precisao.org/files/files/57306530480.pdf In PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/70707067217.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/xogezejoguzadomajivilek.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/pidamosaro.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/17079725753.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/45985089568.pdfIn PDF document text
    • http://e-sportis.com/images/upload/72988202696.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/zisutelenaripepilemetiv.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/93846146780.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/73709336846.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/roxevozafuwotaxezukidi.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/3067308249.pdfIn PDF document text
    • https://gdaniec.com/upload/files/48310129316.pdfIn PDF document text
    • https://dukumanis.com/contents/files/62001495267.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/73751967680.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/18520410127.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/86450573489.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/122577408.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/92481719741.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/joketajudukor.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/61281602257.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/pikanamupazodutuxo.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/rajedesapaku.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/82358410536.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/timunakifizebatogakuluxu.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/48926130318.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/kiwotiluvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=n64+emulator+pokemon+gamesPDF link annotation
    • 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://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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 17120 bytes
SHA-256: dcf002d40ad17ffb7cded3c8bbe143b1447de400dd7581dafe8c38cf30712c1a
font_01_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10920 bytes
SHA-256: 498ba1a73e6eee5e666f48cafcb0845bc5d84b884442441cf62d60d59ff13446