Malicious PDF — malware analysis report

Static analysis result for SHA-256 8019c66caa84c5fa…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 19:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d1e7fbdeafbad307e746059c9b98fa1 SHA-1: daeb87d8f2191a7a44a05f2da4ff314641111ae1 SHA-256: 8019c66caa84c5fa58be9a92cbb3f0e2f344f03199954d12dd51597965d49dd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or spam campaign. The PDF structure itself is also noted as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=how+to+change+alarm+clock+sound+on+android PDF link annotation
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/488513473.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/gikemibozimojulapar.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/81561121996.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/53832553138.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/juxefetuxedune.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132486d84ee9---98421374790.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/46813930003.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/44766638797.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rowawemupado.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/vukovulopatiperugibunasi.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/givulokarofexusa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/72fe8e3eef3eedcc7fcce532881aa97b/48773090094.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/42692566594.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jowokiketodowigitufibelot.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/vagumewenamexabuwolov.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/wuzowuxe.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/45269021413.pdfIn PDF document text
    • https://auto826.com/uploads/files/xovisabupofupar.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/4726776102.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/45058413431.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/64411313360.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/zozimerenekegepelupesume.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://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_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 17240 bytes
SHA-256: 3460a59a411868aa9071214dd1ef183f1f393033fbf33bb2a665c25fb72ced80
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11088 bytes
SHA-256: 8ca725de21a683b7840a80dbc4a02e012ac6b96b94c08ac4e32c5f76dea39f28

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