Malicious PDF — malware analysis report

Static analysis result for SHA-256 16513bb44fb3ab27…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 06:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e150eecaaa934e6d0dc59f4a9e932d5 SHA-1: 06d60e08f2e582255a548aeb791da9f0de8207df SHA-256: 16513bb44fb3ab27f6647e41a975609fc40d7b9be5244e7a822a4c96d9cd9a0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=android+spam+email+filter PDF link annotation
    • https://littleedupark.com/ckfinder/userfiles/files/potelogubumaravu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090719572273499.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_095543.pdfIn PDF document text
    • https://kultmotor.hu/images/files/68967540626.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/ludusen.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wazobizimakakugisuraguf.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/36962651984.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/donigoramimanogofuvil.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/modojiramonizugejekoxa.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/6730517843.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/xagizoxu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3567e1ad---83514441431.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/bavufotagawozopixuf.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/16683900390.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/64876492496.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/movomigetal.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tuxidow.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/pagabe.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xokedexatukogalubigav.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/98396856733.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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10640 bytes
SHA-256: d40ff61af8186cb1b6d4676a697891a1d068172e452cafbfd610476cc4ad2e06
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 17184 bytes
SHA-256: f9d0f23f9639e2bb9abd31e7fd8fd9b46e42b34f69406ca4e7bbe1c52989cc6b
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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