Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1281541aeafc712…

MALICIOUS

PDF

87.2 KB Created: 2021-09-23 23:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6d7042691d14bfde7de965d458fea95 SHA-1: 32676ca0b900471f725d62a668fce102111b146b SHA-256: e1281541aeafc712946a1337765c65bc1f3f240594037b8d7343183ab5d8c5db
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://expnavi.com/sites/all/sites/default/files/file/vudowebodab.pdf In PDF document text
    • http://concilianavarra.com/userfiles/files/vobadotek.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/43385478536.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/muvonamovimedipuzenizewun.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/dolibuvupa.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/gagakerumopomidiweko.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/10600099295.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tokoremosaxe.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/xidefabara.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/setesunenugalaporudoben.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614053c76e976---soxejakesototoxo.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/3885649358.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/5932401368.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/nibemut.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/21712146333.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147782cd5714---xewurabopugamebafovof.pdfIn PDF document text
    • http://ocung.net/img/files/45312388647.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/74412100683.pdfIn PDF document text
    • http://snft.ro/media/file/gesulafup.pdfIn PDF document text
    • http://agilesolutions.in/uploads/49780231567.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/benifikukipego.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/lepalapipuf.pdfIn PDF document text
    • http://askort.pl/Upload/file/45302732366.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/4444022600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=text+not+going+through+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/saximulu.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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 18128 bytes
SHA-256: 4feda408a8d69e6ada101c7db9113311a5295655b3c6753e25946f81dbb9ba0c
font_01_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 10476 bytes
SHA-256: a8d353774f885eb860073f71455a8cbc365461a926695a335d3f14655a8ca68a