Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9c54734c0dfc5…

MALICIOUS

PDF

81.1 KB Created: 2021-10-05 16:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6fed22feaa1ff326d845bec7460ea92 SHA-1: 30ca4d3bdd4a2b22b63401548dc908a4bbbf30ed SHA-256: 1da9c54734c0dfc5056ea0abe6fdfd12ec36fce1a1a10e70b0b84cf2016b8c82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=drive+from+cancun+to+tulum PDF link annotation
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b003a7ca0---49030053185.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/52349210286.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/68621008238.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kapotiwuzuzulazawo.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/wezeximipuse.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gobaxemubonemekudonakafax.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/dofixanofakit.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/forowetatovixowetavabiju.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/nunivasujixodobisirimipa.pdfIn PDF document text
    • http://calisnt.com/uploads/files/45498721991.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161465eb572305---wabuwanuzagovotakewaxurom.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/13582304190.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/12389567003.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/wexaxotajej.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/busigejuxupef.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/xavuxaloderupipajeja.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/61511561548.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tuzugesifevawatitupaso.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/73050572054.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/28217977898.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/bovesibadudumi.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/74526156148.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/1357637364.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/jazoker.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_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10496 bytes
SHA-256: 484a663ff63c63e48746216159fd19f2d696a58646ad045a56306bfb3bcb600d
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 18508 bytes
SHA-256: 680877c5b581359947f158f69a7bf93640145619107c543c7beebfc9abae284f