Malicious PDF — malware analysis report

Static analysis result for SHA-256 b584b757aa4b450e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 15:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdf244b21426feae8f96c7ddb0d23430 SHA-1: 2900fdd7b584d0cb2fc0ba51e62822c1a1ff5634 SHA-256: b584b757aa4b450eb681dfc88d45a5de9b72c978c9115471182536533b005532
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing directly to a raw IP address. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the exploitation, and the direct IP link is a high-risk indicator for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://slenderclub.cz/ckfinder/userfiles/files/19811051474.pdf In PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/25201983009.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/20621467216.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/todotasipaf.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/70398321988.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/1176534170.pdfPDF link annotation
    • http://soleilboo.com/images/uploads/files/85293417890.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kewexorobi.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/vinadodorewiwakigoda.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/17071629132.pdfIn PDF document text
    • http://fructusartis.com/i/File/pupaxuvuvebuxarekuxojeto.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/fovuzaveref.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nefez.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/fefixemurufipezi.pdfIn PDF document text
    • http://indemo.pl/Image/files/jiwapimototevitomimawa.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/tepubipejusenivukilewolos.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/38886018206.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/sedutigotokojiledemesar.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/kitepefulalukopot.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/newedofemir.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/sifalenetiwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=file+transfer+app+from+laptop+to+mobilePDF 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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 17024 bytes
SHA-256: ce381901ca8752903ce933886ec7b937e08ae31112fc270fd9ff5faf31794285
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10636 bytes
SHA-256: 47e3e97c3d7ad119c3f762546d27032f36461bc3cedd50669164834763f534e7
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1