Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a871d7386e2a52…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 11:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c6449032b4ce9964e2d492d82840dce SHA-1: de9044fbf9e82226f8e3f48c389be05bcc31dfdb SHA-256: 77a871d7386e2a528754f946cfce30041e8df050a6f8c2cbbce9a34710f6e6ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or link-farming attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely serves to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://maytinhdalat.vn/images/uploads/files/44337466811.pdf In PDF document text
    • http://www.andreapondika.cz/file/17347962982.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xawotuxi.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/15031233068.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/58115088655.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/79540567894.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/fitega.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/72406465597.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161304b3db0d37---48530367386.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011136047618.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/97852145131.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tovunoveg.pdfIn PDF document text
    • https://renteci.com/imagens/file/sekikejuxalezola.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/72045637951.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/lexuvak.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wumujonudivizepamoz.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210910212015479.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/67451349113.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/figosinigojukazuta.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vimefabawusaf.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/fejazevutorujumamajek.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/5750910995.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/gevafinak.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/tojilomunobak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pdf+language+converter+app+for+androidPDF 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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 10796 bytes
SHA-256: 9501199036a090d6f6b240e14913c17bd9e0b4880623929e6299e7a990ce2afe
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 17364 bytes
SHA-256: c4f210ffa3bf160160660b128a9f53beb673c1b77713fe0b46f4e1475ac6d113

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