Malicious PDF — malware analysis report

Static analysis result for SHA-256 443db70020b57f68…

MALICIOUS

PDF

82.4 KB Created: 2021-10-04 22:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 023db1e3a65e7b069d6cc7f85e1dda6f SHA-1: a36a6d047f81dd752426c1211c7639b8c95e8a45 SHA-256: 443db70020b57f6888cb41d1bf66bfbaf7f7ad8aa03d8232bb899f5e5005bc2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to potentially malicious sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=clash+royale+apk+android PDF link annotation
    • http://prepearl.com/uploadsfile/63409978071.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090717001286.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/38216357335.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/lunamomozifowaviwa.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/78794014914.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xekuwezap.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132edd945454---giretixuxiropukowokaveva.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16155a64c00b18---38828761591.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/17041253459.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/72601061599.pdfIn PDF document text
    • http://vinmexindia.com/uploads/lujosotorupelan.pdfIn PDF document text
    • http://mgrima.com/files/file/biwipikomisogulizefepi.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/18300374064.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/84429669095.pdfIn PDF document text
    • http://partnercable.com/files/90014646093.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/sexebosevagenujeto.pdfIn PDF document text
    • http://azizolace.cz/images/file/mikulozotojosu.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/rituwivilujuwaxo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tazipolavibepeb.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/87519482798.pdfIn PDF document text
    • http://prosquash.by/data/97582144214.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/69136803109.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/zagavilunozomufidara.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 18848 bytes
SHA-256: f586d7706649142280845cd0c2c58225f8b1faf9a3f1a54151245f9e58cae5a4
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 10628 bytes
SHA-256: 5f37356ad6c35a52b3e9fbaf330b172dc83934f18f783707b431a878751ec43a

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