Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce6b3738df10f85…

MALICIOUS

PDF

100.3 KB Created: 2021-10-17 17:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4248a0ab43678decfd90d7c25697d88c SHA-1: cfe1b397d255ae0f964aa40795ccbc8552f87551 SHA-256: 7ce6b3738df10f85cb574aab5763760a42fb5a3733d0a5d562b8998ec20742b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS and external links points to an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://garglob.ru/uplcv?utm_term=communication+network+in+an+organisation PDF link annotation
    • https://biocoils.com/img/file/waxepixekoviduvododepux.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/50703910175.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/dipitezunerufokasugibo.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/23986874390.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/50580955771.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/vejevagejuduxadibogad.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fuvuginasata.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizibupafew.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/pifutetajikevororubo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/93861581738.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/90276965470.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/3135656900.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/91663488890.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/96925124646.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/puxuder.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/84412180141.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202110130752499484.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/cc2151ad8acd6f890f6686788693bcd4/boxub.pdfIn PDF document text
    • http://unsersohn.ch/images/file/jotesuzavoxugutalabetala.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/venerebizekef.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/94252866001.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/96846620794.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/zusamekunaganemes.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/luxukuvimugonopol.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/kizomupefeg.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/wenose.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_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 18920 bytes
SHA-256: ae88c98f9653cf465577aa355442337e3364d6aa39cdf0f842bed87184180ac3
font_02_sfnt_off000169e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E5 10836 bytes
SHA-256: 2457495ea4ac2c39ea317dad1dcc982df333c4d6a66b368047fb1e941166b9c2