Malicious PDF — malware analysis report

Static analysis result for SHA-256 3467136b49d0df9b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 21:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a65f94c5d814c6b9c1acd6e7670a97a SHA-1: b5464bd67183c15e22cf09ac3721893cedae2c9b SHA-256: 3467136b49d0df9bfd4fb8bf290c212a87900b6c7954f4cd8bd6f502dd6390e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a second-stage payload. The presence of embedded JavaScript points to its use in exploiting vulnerabilities or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vhssirimpanam.org/ckfinder/userfiles/files/62885686212.pdf In PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/zotowiliruv.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109120317216739.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/28020872001.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/17805613850.pdfIn PDF document text
    • https://priscar.com/documents/files/sasadapi.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/47947202188.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/21320929461.pdfIn PDF document text
    • http://topstec.com/d/files/31408661299.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/26038323313.pdfIn PDF document text
    • http://honghuibio.com/d/files/72572051726.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/malunupojivigupudufom.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lafawubikip.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/24056213517.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/12730634194.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/85920487532.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/fojujusapejijodixerafezu.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210901164930.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/tatem.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/folozajafiw.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/18284592932.pdfIn PDF document text
    • http://bankerz.in/qpic/files/kosav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=windows+7+home+premium+language+pack+downloadPDF 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_off0000acbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CE 15532 bytes
SHA-256: a44ecbe26a392c92659efbd08a9eedb1a4ef2053269b1786d2fe438a36a1f7dc
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 11184 bytes
SHA-256: 44f9b23c9f0fef915405ddf15bbc0fdc586b1a3b6f7d0bf27cfe148f236aaddb

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