Malicious PDF — malware analysis report

Static analysis result for SHA-256 d306aeab025612ca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 10:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5292db7a5aed2aa15fdb96b1254577e3 SHA-1: e1d89cc6794628dfd55522f23643652653fa441b SHA-256: d306aeab025612ca2a31781e81c73565c2c0e883ed968d92d19cd40bdedb7cc4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://halkapsikoloji.com/userfiles/file/10959302524.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/goditadetarenojubarok.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/69171983961.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/furakijelesalodopavazejuz.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/71525293964.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/68189765599.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gaxafekopinuromaxigepav.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/10323910940.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/dovuvaximigaviv.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xiripep.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905012255101279dg8fw4.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/winanago.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/39248183323.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wikowebovedupi.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/zobewusuzowowutu.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/rolomiladidifaso.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/noxiwemimab.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/dokuguriwozumowabaxosukan.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/57988946731.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/tasefupugovobinazedejiga.pdfIn PDF document text
    • https://costarica4d.com/contents/files/68698506488.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/13675363103.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/15099148836.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/telapazujajopuxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=first+aid+usmle+2020+pdfPDF 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_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10752 bytes
SHA-256: a4f83323abccf94b9ae986ab7911e8753c919a6ff04741d438dee50d1875faf4
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 20316 bytes
SHA-256: 1f5f609368255fa37a83b8692497313b63e05d598e8e33a12a521e019cacadb0