Malicious PDF — malware analysis report

Static analysis result for SHA-256 a575aeb33bd2d345…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 16:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dda3303b2a7ac1355b08eec1cbb47aa3 SHA-1: 1731920fe619326bcad3098aa175e332d65fa8c4 SHA-256: a575aeb33bd2d3453905a72b21ece16c82b580659d2744950ae511b49fd25f47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and external URIs, indicating an attempt to execute malicious code or redirect the user to a compromised site. The presence of a link with a 'download' query parameter and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=download+ultimate+ninja+blazing+mod+apk PDF link annotation
    • https://perfecthospital.net/ckfinder/userfiles/files/bijudapozekemogegenoxigos.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/46549189516.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/kipajobin.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/zazabuvupevekesozimamuk.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3b1e4ca7---solimanalolaw.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/valerugaxeve.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/32437185404.pdfIn PDF document text
    • http://lukinserv.hu/file/ladij.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/vonajasawozipepugexaneliz.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/82170762988.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/38673191225.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zenuxunojuked.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/nojopuxoxosokazusu.pdfIn PDF document text
    • http://atomleasing.ru/media/File/6221777344.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/88401442423.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/47412667647.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/24347742990.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/fegekazoxotavaraf.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xupokekuzagu.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/wuniw.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/33738599399.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/45124174704.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/risabawobu.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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 11076 bytes
SHA-256: b5526b3f0e3832f84cc358ea2a4ec12fba54b2318fb54ec43efc58e7ac29db3f
font_02_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 17496 bytes
SHA-256: f20866577a3fef298d140ac85654c87cbfcb01f0776e5546e5b558997ab0acc5

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