Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7b773121aa3f34…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 06:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f53a128b9042b84d942350da51b3fba SHA-1: 73d4798c63425dfc4f420faf47f087689579d96b SHA-256: 3d7b773121aa3f349d25a3b980c759bd12f1e146911d595734e7c60c49f627e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the PDF as malicious, specifically as a phishing trojan. The presence of many links and the link farm heuristic suggest a phishing or scam attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://residencecarlofelice.com/userfiles/files/nobowafono.pdf In PDF document text
    • http://status.cz/UserFiles/File/busakirasipakag.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/binexonu.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/faligenimoxuwesana.pdfIn PDF document text
    • https://frisch.ro/files/file/93259206333.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vunukel.pdfIn PDF document text
    • http://client.diffuse.info/files/15591522456.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/limadena.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/6445200050.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/31347141693.pdfIn PDF document text
    • http://vln.nl/files/file/xisabafaxijosafivulupigew.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/14960663486.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///56903248334.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/rezutivowulari.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/33884889271.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/55247552730.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/12393996142.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/gutowevedixemomugogi.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/50267213382.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/sixivinog.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sonimopiminujaturunixuv.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/65236889257.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/83153015435.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bbfe6e3c---22456994143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=developer+options+android+lollipopPDF 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10452 bytes
SHA-256: a03202abc6e4d224938e2b5409bb38a9c1319c315a8add83ccd70d16d33e4b97
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 17856 bytes
SHA-256: 1949f2b197dc35e52bd1362c6f0e77407c1775363dd64f6393db916aa26606e1
font_02_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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