Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e857d2da056e206…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 00:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e881abdd574eba418211c82ad7f1a7bf SHA-1: dc38791703bdd09690bdd5094039320dfe63e001 SHA-256: 0e857d2da056e206dd42a0029fe2dc578383afe9513eceff6a2d7d0aa4e60f21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one pointing directly to an IP address, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this PDF is part of a scheme to host numerous links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://noithathoaphat11.com/upload/files/85112149713.pdf In PDF document text
    • http://pusancard.com/userData/board/file/gakepurobulige.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/91378546037.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/kelazemejiroza.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/babufexalotezojeriropedot.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/makaxegimizuxopuximun.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/15843797224.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zinikimure.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/15339818588.pdfIn PDF document text
    • http://loxocongnghiep.com/MINH/user_files/file/koxidixanaj.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf2a5b7795---34859997781.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/37608048695.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/nijag.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • http://baoveantam.info/upload/files/44156505391.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910050121.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/gipoxirazifawivomebu.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/rekipobafapof.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/53410725336.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/gurimiboja.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/gugofedamal.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/poson.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/soguw.pdfPDF link annotation
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/jamemukud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rust+ios+androidPDF 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_off0000ae5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 14512 bytes
SHA-256: 67fdf71f32736c53b31c2c148df687620d304a531c5f583c98fd25b39fadc947
font_02_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 10208 bytes
SHA-256: 3b24f4264fd63b3b9b8f75ec93bca78afabba6a8e4980c12aef8dbe67a01a0eb