Malicious PDF — malware analysis report

Static analysis result for SHA-256 a084ddcd7b871eec…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33864b386fb97e4c3553228cf5ff85ef SHA-1: c24a291b16be59eb0d87e24f54b6615436476e4e SHA-256: a084ddcd7b871eec092d95dc9adfbd43814b07a9c44d7272ff1bd89e3c410fd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection: Native Code Injection T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely disposable, suggesting a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gadkowski.pl/repository/filemanager/file/bajoporoligalopekazufesix.pdf In PDF document text
    • http://aristosaigonhotel.com/uploads/files/kisasapizixorimojididaw.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/xavevoxonewelefobabifage.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tirefogewumogusinapoloba.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/noniwegijarigogazese.pdfIn PDF document text
    • http://chipgene.com/image/files/20210910_021723.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/18524088231.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/90048565247.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/bubilezugirinerepepizuti.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/72812800656.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/036eaf999dc8606b9ca740d45e06fe1b/64916126956.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/87467000671.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/69085095596.pdfIn PDF document text
    • http://xsteelstock.com/d/files/paxegipoketudo.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/48731640722.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/1975294959.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/merepitux.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/20400545650.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/sinepulazasepemazupupel.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/81168629867.pdfIn PDF document text
    • https://datajournonepal.org/files/kubetizesap.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/5419933565.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/lakezujadiwaxexaxeduwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+my+password+on+my+phonePDF 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_off0000c119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 10908 bytes
SHA-256: abaa1847c98ff3f1ae9086b8858227ac2ba2144a37eab3d0c65a9654bb99c8d4
font_02_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 18304 bytes
SHA-256: 17c74b300a8d00b9946e53b7488cc8c583ccc2cbca602cffbe7c4034c6e394db