Malicious PDF — malware analysis report

Static analysis result for SHA-256 270cfbbd74fb9c20…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c2ff3c851861ebd61cb703949977cb5 SHA-1: 5bdbbd204af1d57acd34bdbfa3cf02cdc3706de9 SHA-256: 270cfbbd74fb9c20d54ceda442dba24d94c8ad4a759378cd25a98c151a877f91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests it may be used to download or execute a second-stage payload, contributing to the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.hkfew.org.hk/ckfinder/userfiles/files/66967127925.pdf In PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/25278989560.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/43519473842.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/53007550988.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/42312623139.pdfIn PDF document text
    • http://vucert.vn/uploads/files/jigumojaloda.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/76508303345.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/telufiliw.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/juzasamiveleruru.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/080524081696.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18843855624.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/94387852643.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/rekigo.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/lepevudi.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/19805381003.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/62286256106.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/fimapaw.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/witasofapezuxokasiwejak.pdfIn PDF document text
    • http://flomojapan.com/upload/files/61498936318.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/53016916656.pdfIn PDF document text
    • https://latarnik-kopice.pl/galeria/file/voxusixutatapizanevitomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+camera+recorderPDF 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_off0000ab46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB46 16240 bytes
SHA-256: 7f79579938a7ee9cc766f84b3813ac602e49ce7477a71fe04d7a845a46c761c3
font_01_sfnt_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10200 bytes
SHA-256: dc2a1591cfe469d99bddee4ae96cb44a110fcb0f9d5275fabd3df79ff2d757ab

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