Malicious PDF — malware analysis report

Static analysis result for SHA-256 6859f481d6cd60c8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 09:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b00b2075b670ed68ad35b60a2edf26e2 SHA-1: 33674b296b08efea2a68f3292c748d0e3abe0c86 SHA-256: 6859f481d6cd60c877fc0c0354575f4aa55d10a963f9b97ff1eba7214aee4701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs pointing to external sites, likely to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tageedesign.com/ssmpt/documents/file/zerevik.pdf In PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210902185740.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kupilewefuferasekejug.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/60741542270.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/5435606591.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/kuremevonov.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/6140204703.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/gupumarepavedadotonarejev.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/polejufiz.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/13/file/55956625929.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142016ad3d04---18576542846.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/30009953845.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/viwobuxevu.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/75493148704.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/3919623226.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210916_084411_1805.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/sulibexekopumokalida.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/lewabofakixotiso.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e23ca676---nagitesix.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/suvinexapadevozixawi.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/29783139820.pdfIn PDF document text
    • http://leruichem.com/upload/files/77016793997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390894e2f74---fapiwojomenisazepibexoxum.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///23395664554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+hios+launcherPDF 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 19004 bytes
SHA-256: cd46f0a5afa63e1faea6c5400333700e91684d0d6c7fad285a17532d18765225
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 10740 bytes
SHA-256: a6110eaa5511f42d55eb037d4515941d1a01cc23c1798e9feba239c0dc641d23
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1