Malicious PDF — malware analysis report

Static analysis result for SHA-256 97863eb8f408f812…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 05:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ba710c0eb8e00bc3c5762b838aa5921 SHA-1: fdd70b6f93ed583fdbc95576a1191eee51bb58ae SHA-256: 97863eb8f408f812bdac7630a45e8e4515886b83cb0067be1126a7bae3eab5bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical heuristic indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript, suggesting an attempt to execute malicious code within the PDF viewer. Numerous external URIs were extracted, many pointing to potentially compromised or disposable hosting, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://artgrafika.cz/userfiles/file/wafujewemigemaravakuwoxe.pdf In PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/40325009208.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/xuwir.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/42871030364.pdfIn PDF document text
    • http://perksys.com/userfiles/file/67385315129.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/20349354953.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4f36a8ce---gedubujikoxozutejinur.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/laditagenawem.pdfIn PDF document text
    • http://flomojapan.com/upload/files/14958371142.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/18277631392.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/depimerotidibiti.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/vevelo.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/48815452095.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/95361818408.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/37119136781.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/24050742621.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/69044860669.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/turoze.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/kuwevuwusedisujeredufaz.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/borugizalogonazifomiwetol.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614297da5db22---gonobawubikajak.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xomopekilin.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/3842475139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sbi+freedom+apk+downloadPDF 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_off0000b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 19616 bytes
SHA-256: 4e6d86d1a67299dbf348786e4835380d47dd39a50269447d570c9cc2c153c733
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10784 bytes
SHA-256: 0143d9332f46125e8c5309d00d74e7c0beefdba59139a65024a23912827a48be
font_02_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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