Malicious PDF — malware analysis report

Static analysis result for SHA-256 121a6ccffb0270a0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 23:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddeaee4fd3fecc77eb6c9e47e66c8290 SHA-1: 225b3848e90d62fbd0e0ba5f8b3d3799da108a05 SHA-256: 121a6ccffb0270a0e00f4e224d94d6b6eba88ec9e637e904f68eeecea351e170
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=block+strike+download+apk PDF link annotation
    • http://rts-3.ru/upload/files/97336270519.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb11985f44---94350183456.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/15248181597.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/nakadapowixex.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/43601431108.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/26293595992.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/32989153592.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11313556624.pdfIn PDF document text
    • https://equimat-cheval.fr/file/82303971686.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/ledigexufo.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-15-20-03-17-4cvU8XPD.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/57850573977.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/89304196890.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/78879983556.pdfIn PDF document text
    • https://gilbertems.com/videos/file/lelurov.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/pirogim.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/tibakamubobu.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/60828664221.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/jopobapenadozebomu.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/4718736198.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/zuxovo.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/totedanorimowimas.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/29495717197.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210907091554.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/niwodekiwewutujod.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_off0000bbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF9 15536 bytes
SHA-256: a282fac661cbf8187fd65e7d64425865272ac0054276e51564c1a66b317a7d25
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10736 bytes
SHA-256: 934720197d5ca436de15aecd742b70b3e66192d5744724ecd9178ad979c423b4
font_02_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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