Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4810599a8e9645…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 19:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 016ca82f626026182796b8465879fca7 SHA-1: d5d4f2f5003c2cfdc9ea9abe28cf0af12f9d2487 SHA-256: ea4810599a8e96452d3a568fbd8152e846b74452ea5e38a2a1434aa9c384ce24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm, likely directing users to download further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://195exim.com/datas/files/90288029528.pdf In PDF document text
    • http://massimomoroni.it/userfiles/files/4133209045.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h75fq9hj6408m0vvrhbbk8rne4/muzusamusaxopalegureb.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/42113856398.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/78535436567.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/19424266453.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/78966967786.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/13222326326.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/xosobuxejer.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/xalexesiwodolizugapikapo.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/wakaxosuvakanesopegipug.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/46769459614.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/36044388978.pdfIn PDF document text
    • http://mp-journal.com/media/file/relesav.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/12014886533.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/90820730683.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/romorobito.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/97087996831.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/juwawananubisa.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/muful.pdfIn PDF document text
    • http://belv.ru/userfiles/file/93761671496.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9a9814bb---22353934686.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/rageboxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+game+ninja+heroesPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/takojubizixo.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_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 17192 bytes
SHA-256: a135bf679952bfc3fc6bb15a00ebbde3add74aa5371a0dfbe1037b765c216eb2
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 10812 bytes
SHA-256: e7e301f2f5ba6148af455c469f5d226c91ae0c52e06c5a04b9cff1ef2148a7ab

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