Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ac56f6064a1124…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 15:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cc748f1748bdcf4386bcd9599c4d744 SHA-1: 16a1be83b248ed5e50635d6e61fc6aa5ae78b03b SHA-256: 90ac56f6064a1124c95299b07a602d83bdca879a7a66dcc657b256575b2832b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The document contains a link farm with numerous URLs, many of which are hosted on potentially disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing lure, likely intended to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614408be39003---genofi.pdf In PDF document text
    • http://netflor.pl/upload/File/fovov.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/43459620844.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/46329546925.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/febewasav.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/wumugibudugiv.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/fewogafi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/13057170588.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e19eeed3673328863fdfeac4c47de4fd/49102514482.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/gomadudamewije.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/90572269404.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/66895220610.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/kemojezipexetuxotabavivo.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/xaligufipuvoromitut.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/panemux.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/gomikupumalajufuzine.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/bazifirawa.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/74978307815.pdfIn PDF document text
    • https://hsse.cl/files/42549081485.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///57747984522.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/52077605832.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/58342276833.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/dilemiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=video+downloader+app+for+android+freePDF 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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 17148 bytes
SHA-256: 9e4e77a68a32f9ea639d1bec07281b45593033fbd9f4e2fbaf42493767bf0d78
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 10280 bytes
SHA-256: b9d636f138950b14527a75833272f0a4e38118a9439280a97a5c0abb611e7ec7
font_02_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1