Malicious PDF — malware analysis report

Static analysis result for SHA-256 0498720f3fc5907a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 06:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3773ce6e1d9a476c2a5757fc5a92f4b7 SHA-1: ccfd68c2851d241d09663c8e36472b3c1ae9765f SHA-256: 0498720f3fc5907a24345d025a5cd32c82723f6bfe6b1fd2af18707e371ced2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://avtrak.ru/ckfinder/userfiles/files/subifisenamagakebexipud.pdf In PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/kisuregutuxiborefeguzima.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/50730751942.pdfIn PDF document text
    • http://scsychem.com/upload/files/50567963458.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9f8a1ab6---ledelokisevubejakunuxi.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89897411740.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/4925413432.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/jumufovowukipewomazenebew.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/vebekokedobufolije.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/pozosodinebopoworurenuno.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/30196972575.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/dozomudag.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/soxexamekotabedi.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xigeliwu.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/karafin.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mogas.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/zetifevetutilidosedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=amc+the+walking+dead+season+11PDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 18168 bytes
SHA-256: 13db38cce913bcbf34592419259baaac05e0c32f085bbe3547b881a4a9b1f37a
font_02_sfnt_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 10928 bytes
SHA-256: c0d308e1cf16c62600bbb6a99d16fdf9ecf01160cdc29d6f47ea2fa01967aac8

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