Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3156c8f7d46946…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 05:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e2840bc1cb326d43ec500d56d5c6a2f SHA-1: 5a72634378c22e23d193106640d9b6d7ee8a92cd SHA-256: fb3156c8f7d469468664b668ffd012adbe35b5e68ae160c17bc80ede464a83f9
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a link farm on disposable hosting and a URI pointing to a raw IP address strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiosaletta.it/userfiles/files/93750439810.pdf In PDF document text
    • https://iphastkala.com/userfiles/file/52168789564.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/tesetamapuk.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/jiluxumogokalobelejuzu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pasodenubawoxurajanad.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7c4c7bd9---67314100041.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090946194414.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/madugaboloxulanojazopo.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/dufufozikedip.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/42197476877.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sikixiruxijovivirewotip.pdfIn PDF document text
    • http://koddous.com/userfiles/file/44434045663.pdfIn PDF document text
    • http://exosushi.com/uploads/files/livuzipunupujagojilaxopap.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/93284893210.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/suxapizosiluwuluzubonorof.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/tufivefafujolaliki.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/xizotekofu.pdfIn PDF document text
    • https://ienter.bg/files/52444940131.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/fofogodolirokagitezib.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ebbfa04be6731f7994f1f6fd6cc5c8db/pekiw.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/41369435506.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/27253580148.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/39979296206.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/78534949472.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zikajokatugetagevisomu.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=polish+photo+editor+pro+mod+apkPDF 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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10648 bytes
SHA-256: e74d802a3dee36dd8d77cc8a46df293f851c91fbee152d651803596df7cd4706
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 17192 bytes
SHA-256: fc4f682a9225587a4717c09927e3de82f40ca4b50abffc0012bd551ca6241d18