Malicious PDF — malware analysis report

Static analysis result for SHA-256 b533f2e08ef6fcf3…

MALICIOUS

PDF

68.8 KB Created: 2021-10-02 22:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53a420995213eea5856024a5c315ee5c SHA-1: 654f3d6ef3789ac025fa6219b4da0314b19edadb SHA-256: b533f2e08ef6fcf38c16f231b774aa5d92b692772875f0d6ec186e83bf5ee0d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://shipnhanh247.vn/asset/files/16681260552.pdf In PDF document text
    • http://obkladacstvikolar.com/content/98961670442.pdfIn PDF document text
    • https://slavyansk.biz/userfiles/file/gavukilufut.pdfIn PDF document text
    • http://pinxedien.net/upload/files/digogenafen.pdfIn PDF document text
    • http://miminku2.com/contents/files/pumutop.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/99636861767.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jexutukukikonuxupab.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/32987425682.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/12342667123.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/dunisibodap.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/32353839789.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/96314119584.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/dufipenolodefatugelub.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/zirotereko.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/mutajepurelukulugem.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/nalovosesom.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/bonufetadusadoje.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/numewofo.pdfIn PDF document text
    • https://majubesar.info/contents/files/51881097696.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/sulagadipukodedaregetavuv.pdfIn PDF document text
    • http://ausafe.net/images/art/files/zavenofupoxuwuzogewudaz.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zikibogegu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2dea73030d6998f003306cecd303b173/pokozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=indian+money+signPDF 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_off0000adc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC9 15948 bytes
SHA-256: d14682a247fabf62164e5b6faac4a7f0294bf5ccbe2e84f6543aa978f368d973
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 10412 bytes
SHA-256: 5e8a16120351ac8549689b7c0ff5909ad8622d62eb8d96552a9fe9d0d92f94b8