Malicious PDF — malware analysis report

Static analysis result for SHA-256 7144eb97dce4c717…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 02:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4071e029dc66ca45ed5dc9db71b638b SHA-1: a0de80618b3caf72740a7d160bcf4e56122d3877 SHA-256: 7144eb97dce4c717695935d2052f85e6ccd122f382a7e022a26fb3771f35f334
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=gunship+battle+mod+apk+download+unlimited+gold PDF link annotation
    • http://sotel-perm.ru/site/file/keteretuwen.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109032159038073.pdfIn PDF document text
    • http://didopack.com/files/nojabadevunuvunulapozej.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/55655461162.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/23976214925.pdfIn PDF document text
    • https://durimawar.com/contents/files/88322161864.pdfIn PDF document text
    • https://izr.fr/files/70088288365.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c455ee5d9b3d751fcd6e2af13e12b375/87014138428.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/gagekixuzededup.pdfIn PDF document text
    • http://xhzhengli.com/upload/37731676088.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/39459224142.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/175a9eb5c6181871467647056ec26f8f/28863185720.pdfIn PDF document text
    • http://www.andreapondika.cz/file/wizojatiwededokot.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fikekolosulepol.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30344336444.pdfIn PDF document text
    • https://unaizahic.com/Files/files/vijiwam.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jopelotovo.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/nodebemupegi.pdfIn PDF document text
    • http://spbi.cz/res/file/jitelor.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/fowapo.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/sekeneroguwezefifi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/towinovubirosawo.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/25717649042.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/5215409609.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_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 11196 bytes
SHA-256: d68f838234da64f3027b254098eb5c1f3610d51e770134e69db2506fc48b0d75
font_01_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16544 bytes
SHA-256: a47c7fe3894c828984eac556f4c063b30161b906421e37d35d54ba503a2b7916

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