Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af88ddc22452c0c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 23:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6021c3dc9360ccd98965d187dab1d82c SHA-1: d3e4dda2993ee7b8cc87b318eae727a7887e0bd4 SHA-256: 8af88ddc22452c0c5d012f90d7e54393fce57f6acddde5bb6e73e757142f4c0a
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb499dff84---19595458662.pdf In PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/29011470991.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/90244284152.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/gosagufoxedurutopu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/69144000086.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/jobuxoteborurefudevuvar.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/94100207673.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/lolakelunepado.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/sosuxixewotaxitej.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/21802751001.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/48877018080.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/42111294695.pdfIn PDF document text
    • http://fabtur.ru/upload/files/wutaxisetoromigabimej.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/melozomax.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/73389011758.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/pamesip.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/ridomulelotagara.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/16556552840.pdfIn PDF document text
    • http://zatacorp.com/upload/files/legozexesujuwuvovo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sabuvinemop.pdfIn PDF document text
    • https://mattress-leader.com/media/figoribesejepedojimikaja.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/buwepami.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/97524586448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=connected+but+no+internet+access+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_off0000c0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 16208 bytes
SHA-256: 59a14514a7b7c2cd5cff07d0a22529ca452ef98e93b44e4c92530a8a1d25e099
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10588 bytes
SHA-256: 916505174238ce1958f45f6348211737a5dc379a9ee3c86559303c86064a8235