Malicious PDF — malware analysis report

Static analysis result for SHA-256 d879b18ae347fe65…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 06:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52a45455306e1e65502a28f442349d77 SHA-1: 800a46adaea76d684887494b58fda6dd9a9ae204 SHA-256: d879b18ae347fe65ec76b67e5b23c56df547247f28bbc86a7ad01ed0503668c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://geoman.cz/data/file/tugosesozavi.pdf In PDF document text
    • http://vonschickenconcord.com/uploads/files/94225408830.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///riwatunow.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/dututemidinuto.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/balavevedeso.pdfIn PDF document text
    • http://termocity.by/pics/files/7852821043.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9ef7a0e9---xuwuwama.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/mikave.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358c43c59ac---resazib.pdfIn PDF document text
    • http://analhospital.net/file/files/80147376883.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/bawudijuzux.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/latudoramisubu.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912155643.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kajogajujav.pdfIn PDF document text
    • http://gojjang.com/uploads/files/88098889714.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/bobinejevakexexotipek.pdfIn PDF document text
    • http://master-vin.ru/files/file/vozurajosiwamubud.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/29785923848.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/76070979171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+flash+running+live+wallpaperPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 10632 bytes
SHA-256: e103ee7eb42d4e7180316f769eabefb112f419d303a27bda8b194b25713b979e
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16996 bytes
SHA-256: 2d10eb0a8032635bbde7947bd9d414ba672342c1e89e02d54ef215615ee4f336

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