Malicious PDF — malware analysis report

Static analysis result for SHA-256 947ee12889800d6f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 16:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e2de21825da6ab12cca98e1dc71ea96 SHA-1: 5cff45ca70d279c52a16266ffbab2b05d82ba04a SHA-256: 947ee12889800d6f5a058e4fbd0957c35b5c58b176d6ffbe3b1a7be64f842b7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, reinforcing the phishing or spamming nature of the document.

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://oniceh.ru/uplcv?utm_term=photo+editor+app+android+studio PDF link annotation
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/babise.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/gunope.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/pukimexetepemolufajowa.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/36379241862.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/zivedijo.pdfIn PDF document text
    • http://master-br.ru/img/file/19983644462.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/74405324278.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/25762368717.pdfIn PDF document text
    • http://agilesolutions.in/uploads/nifafufexejetamigug.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/vonasukowogamufokipap.pdfIn PDF document text
    • https://www.znackakvality.info/files/14803524311.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630787534.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/2854838473.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/43929106180.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/vudedino.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/18778509150.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4f6055f6---julutoma.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/1630426089.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/79325961059.pdfIn PDF document text
    • http://geasit.it/userfiles/files/34885950100.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/73989655989.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wulafuvamesuduvexesaxi.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091519214773499.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/gemupibevo.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210921095744.pdfIn PDF document text
    • 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_off0000bb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 17860 bytes
SHA-256: 0c4e9d2172b60b18b3e52f66a20982550c3e8877e130b3415555f404f0e48af5
font_01_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 10544 bytes
SHA-256: c2b11f749e66196db2dc36dabac17a0387d3ab9be1ebdd1fc625b834e8a2e12e
font_02_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1