Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccf7ae88d41b1b0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 13:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c01badccba20a282bb3ef70003414ab SHA-1: 315c929b949bc9ae1c171504944957be9c441525 SHA-256: cccf7ae88d41b1b0c5cad702296c04cdb4e553898ed02efc124926f13385ef28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including those identified as part of a link farm on disposable hosting, strongly suggests this PDF is designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=alien+creeps+td+epic+tower+defense+mod+apk PDF link annotation
    • https://clubon.top/uploads/files/33447326309.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidomadukif.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/20861369195.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/digunemavoxe.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/61566219613.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa16177d37---tepebefevukubupizividajop.pdfIn PDF document text
    • http://getem.pl/files/file/dadabubonunofezidefupuf.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/jobumegem.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/50506903014.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305976b92f2---98685396572.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/jerotumivovopotigedatis.pdfIn PDF document text
    • http://rvhifi.cz/files/file/1807665084.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/bojobig.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/85839569517.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/57494982109.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nesugowejubuzabofob.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xamexulowori.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/45576705605.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/9490796556.pdfIn PDF document text
    • http://climtech.com/files/files/50859079169.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zifusos.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/pepodexisujebewaviwa.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/60063868765.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 10940 bytes
SHA-256: 8cc5ea53ac92f6b0462f024b820f02b758d97caa82684fe15cef831264fd919a
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 17796 bytes
SHA-256: ec93bd213c77489546d9af18eabcbbdbeca7d940f943a821166f9ed08c3f0ff6

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