Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8ffb0e9efddb9e…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 00:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac98c7e65f4ef527595ed801ec2fecec SHA-1: 978ed22ad307e4f16b9dde5b0eae17781a076abf SHA-256: 7e8ffb0e9efddb9eddcd4edd4feb7b523fe15d66f25a1206d91a1b10d0b0fdcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute further malicious content or engage in phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a campaign that leverages external resources for its malicious operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://juhaszautovill.hu/userfiles/file/refuwebapisis.pdf In PDF document text
    • http://prosefkuchare.cz/userfiles/85495953619.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/barebopifaraxizazaxawiwo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e7cd6fba---63399420552.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/16708841533.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/98339576200.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901153155974086.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/zonevazoxunisowulefugefi.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/63214487369.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/72248657807.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/kuwesuxafixavifixojopeki.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/40444264607.pdfIn PDF document text
    • http://vipdiler.ru/files/file/6493609579.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/jalez.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/22146403314.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/20117827390.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/tagugeroregejudaxaleveba.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caf61c5bda3012ee961b693b2eb559a9/8533429001.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/97777356683.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/90134039175.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/bavalewusuw.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/55984238815.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/57092391694.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/rimalutoxazoxorumivom.pdfIn PDF document text
    • https://businesslife.com/content/file/42855985506.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/diwizi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/xozoralux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vault+door+id+unturnedPDF 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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10140 bytes
SHA-256: 0e0b63de881d397ab3bcf6725fb7670670b482a1d13a0c19f4c29cd26773a039
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 19860 bytes
SHA-256: 5f08139f89235cec0412f62c1deba8bf92b96b23903ae26540bb73fd5c29e00d