Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806a2140a0b2fb9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 07:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd36d2fab2e6d77cbb357e452e8a3da4 SHA-1: e2a76f6738939cd216105cb4f81f7296c84b1abb SHA-256: 9806a2140a0b2fb9b02273b13ae8316ae3e140bd214095f67cf74034c76773aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of embedded JavaScript points to T1059.007 as a likely execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://crysiq.ru/uplcv?utm_term=jogging+before+or+after+breakfast PDF link annotation
    • https://posaonakosovu.com/ckfinder/userfiles/files/95563633571.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/gavix.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/67676296088.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pikanozitapixis.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/tumotozijolatudelijupaf.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0d6e4582785e84569a1e2a41151e283f/9907431481.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7e5bfca43cea9bfbb3bcd31f4a516bc9/92059299031.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/43593705247.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fijiwonaterafi.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/sipavoxejupi.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/98212970738.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/zafidodudubusezunixe.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/murimamip.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161326bb5eee19---nebod.pdfPDF link annotation
    • http://ildungrice.com/fileupload/fckeditor/file/mogebubiwajurefefijevu.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/ginekaf.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/31388237222.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/23008365321.pdfIn PDF document text
    • https://tele-video.ru/upload/files/33943101553.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/zanakogoxawegafifetijabap.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/97952193276.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/daveralo.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_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 10564 bytes
SHA-256: b6f87315feead430e67b807e223bb5431b6f860bdda1025a1f271d6bd6bc9928
font_01_sfnt_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16864 bytes
SHA-256: 70164b48efbe2365d0c0508377ca44690ae3fc19f2ce6b7807844adae95cb1b3
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1