Malicious PDF — malware analysis report

Static analysis result for SHA-256 be98302349e4610c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 18:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acd38dac576f1ad2503989d6abf0300a SHA-1: 6ee37f8ee89c0c9a911c8b66648bd6d5871a50d0 SHA-256: be98302349e4610cbfe663143f293c1854e23469c0695d1d11fbdc6dfcb917c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to disposable domains and are structured as link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/katoratitonexijakuj.pdf In PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sanijijisobilorak.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/metubajazu.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/vereropipamoxavani.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/79088908027.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/48687368518.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/8826726126.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/31797988531.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614242cb44dda---dibizunili.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/kajuzojazorovojetu.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/womebolexediw.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/36709855009.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/viwegevumesujab.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/xigabepikatemiko.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/25213238992.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/kesanikuzevujokasitiv.pdfIn PDF document text
    • http://snft.ro/media/file/xikezozesemapoxumuj.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/waditikukipa.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/65576993158.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134788d7a5e1---rinemuwulu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/26767278376.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/gikotunomakijosefabefed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+external+storage+to+internalPDF 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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 10688 bytes
SHA-256: 010bafcb54b4ac1485025380307aaa7d5bf6e36b6aacc2241ec5904500233241
font_01_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 18320 bytes
SHA-256: 7eeb7f52f08f57baf6717325230670d21d331c8c97e8124b003895b5498b7d83
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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