Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdf449e19f73e6b…

MALICIOUS

PDF

82.2 KB Created: 2021-10-06 01:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55efdcc0374db915f15a9af27631a063 SHA-1: 1f49583d4a9fa6f02c1842b6591ea93d03e337eb SHA-256: dfdf449e19f73e6b0158d97238304eb30cb9fff9314e23b479a12aba2aa6c205
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or spamming operation. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614618d307962---54399638740.pdf In PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/99424441315.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/94281015542.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/tinoxofuvofivame.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/53696346441.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/52850265578.pdfIn PDF document text
    • https://cncunse.com/d/files/81174307478.pdfIn PDF document text
    • https://lordoptika.hu/files/files/82246229325.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vojobitaze.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161505f33d7461---moruxifedasakine.pdfIn PDF document text
    • http://ahchala.com/img/file/kukukapozojotowiv.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/55712892453.pdfIn PDF document text
    • http://staropolski.net/Upload/file/suxutokuniwe.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/79392571555.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/wezerogujurafigo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/gexuludukesododo.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/zoberudogetawabibogixa.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_52E71DAFCAC16222.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/46625935132.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/18600139582.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/40955818281.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/17258192900.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/zopebusodererepifevivox.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/bolirijimuver.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/xagov.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/3426492802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=roasted+swiss+chard+with+fetaPDF 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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 10552 bytes
SHA-256: 165b444edb37377c36d0a683e4f8f104799b8a961a501167632bf3530a4da69d
font_02_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 18948 bytes
SHA-256: 97d0e583864f9dd18cdd127f6978b0fea48524df07a6c0d847022c175279300a