Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f77b93f37c6fd67…

MALICIOUS

PDF

73.1 KB Created: 2021-09-29 12:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73692f2c3bbee649aede1a4078b81725 SHA-1: abf2fd543bdd9ef85d94d52254aea31732768ca1 SHA-256: 7f77b93f37c6fd6744af8eb8bc4462ec47b5c5ab12579ccfae73e2498c1b012e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a potential redirector with UTM parameters. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=ninja+rebirth+download
    • http://geometrarontani.it/userfiles/files/faguki.pdf
    • http://eternoohydro.com/d/files/26471482669.pdf
    • http://liubeauty.com/luutru/files/45576930113.pdf
    • http://hejia-ele.net/upload/39264528079.pdf
    • http://dpnovelty.com/upload/files/jajevetazewuxifipikuzejo.pdf
    • http://yevres.fr/ckfinder/userfiles/files/dajefutofadumesal.pdf
    • https://5ky13lu3-1251.com/contents/files/xuvulo.pdf
    • https://nusbetaja2.com/contents/files/putovovufexapazan.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u74claqrti23qbvl9cavitgd4p/39932613180.pdf
    • https://ratoempat.com/contents/files/73069087271.pdf
    • http://bordahusfeldolgozo.hu/editor_up/96362652579.pdf
    • http://marklaliberte.com/fckupload/file/kabubapilubawufobejasoti.pdf
    • https://heart-calligraphy.com/uploads/files/202109192105039345.pdf
    • http://launensia.cz/ckfinder/userfiles/files/18592173786.pdf
    • http://stnicholasway.com/userfiles/file/74010092025.pdf
    • https://imihwa.com/uploads/image/20210929/files/20210929134606.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/labogirosa.pdf
    • http://bukhatirhomes.com/userfiles/file/gozenibopu.pdf
    • https://etcbt.com/userfiles/file/miduzusojeguzom.pdf
    • https://gizaviation.com/uploads/files/jafobotolimorivig.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/4496477960.pdf
    • http://kadh.kr/bobod/upload/file/dosijumirovegonexumipef.pdf
    • http://mail-business.ru/uploads/file/vozejexo.pdf
    • http://epoxidice.ro/mm/file/rowamokikipaxijemosakerom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e5.bin
6e968c1022a7fa3dcfe662efd10e9ee3fb037ab5b86320e6724c3cfd72c5a123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 19976 bytes
font_01_sfnt_off0000e6f0.bin
35233328b54bcdb84e310405145fcb289872ff5d11c0d82cf7fc7dde212e1810		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10512 bytes
font_02_sfnt_off0000febb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16792 bytes

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