Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ffae77fcec92fe…

MALICIOUS

PDF

89.6 KB Created: 2021-10-19 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 12017d96ba877de542cbb1213abe8053 SHA-1: 649710af36b8c567bb2ba99aa2cc4653b1b128db SHA-256: e8ffae77fcec92fe7df16aec2d93ae22f15cf2e138fe8e2aa02d2ba6183dca3e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains embedded JavaScript and multiple external URIs, indicating a potential for malicious activity. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick the user into believing they need a password to access an archive or attachment, which is a common social engineering tactic. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript and numerous links point towards an attempt to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://studiobonvino.com/userfiles/files/ribodumojeletedixide.pdf In PDF document text
    • http://ecogestval.com/userfiles/file/75762484014.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/pupezodilerilimeta.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/8224832659.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/boperegulutulatabatij.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20211009/211009085525914865x3y75ge3pedj.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/susebuzas.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/duvuzanaji.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/vufivosidirunusufeleji.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/37770022389.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/vopojogavigegiramebo.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/peresabuzori.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/12099661439.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/36357025863.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-29/20210929090107134597.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/32849185491.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/rerixufedebefopaf.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c889a75697---31270256072.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/77311557146.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zazid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=los+juegos+del+hambre+sinsajo+parte+1+ver+online+gratisPDF link annotation
    • https://easyown.ddproperty.com/datas/files/lokaxewavexanifuv.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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 19996 bytes
SHA-256: 373b40c8bb1e68d8723742eacf363d479b4e0e8c9e8475d74d1ffe7433e0f2dc
font_01_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA5 11284 bytes
SHA-256: 29870a3eba75f29f19ae1d342382dde9a6c95d42986127e014ed17c93f09d679