Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92a2c1ed8c2e33f…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 04:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a46d42b95c940d3e62d70ec076edb757 SHA-1: 024b23944498d2cbb037c1cfa32fe8e56d2ac063 SHA-256: e92a2c1ed8c2e33f54baa2055386a767644890a68a8e80030a70323a44d3d818
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of phishing or malware distribution schemes. The PDF structure and embedded content suggest it is designed to redirect users to external sites, likely for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://catamma.ru/uplcv?utm_term=loud+ringtones+for+android+phones+free+download PDF link annotation
    • https://zniczekowalczyk.com/user_images/file/77943628105.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137808d8e197---62718514452.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/48480970749.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/1163913314.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/dagurebatesu.pdfIn PDF document text
    • https://duel.pl/userfiles/file/vilakarenudo.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rajejebikim.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/68227754519.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/41719889063.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/81171883486.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/76596171894.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/ruvapototoxoluradaga.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/rejaxexuvodowulegisaluran.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/jinikidoxobuwo.pdfIn PDF document text
    • http://mosjob.ru/images/file/wapupevokolixive.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/rowinelegidilumed.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vamokunarisojusajezibu.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/namuredu.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/30006217967.pdfIn PDF document text
    • https://music-group-store.com/upload/files/83249151231.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/rosepinatum.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/38826956973.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
stream_003_off0000c7c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC7C5 17132 bytes
SHA-256: 985685faf884c21316bf72396ba8564ef491f35c04a8a0499791ec5a9dadfd62
font_00_sfnt_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10920 bytes
SHA-256: 4d96d72bde6a62f882979cca6f973a005c1b407d21e7ea1127bf0caa59168069