Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fe84a8cfe9edd2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 11:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d08953794ee27f8c6a632ddbfc21d477 SHA-1: 8ef55354e4fc8781b48433dbf457c02290e1f582 SHA-256: c5fe84a8cfe9edd2c4e99f719f2ab757a7209a66eac64f1a8322f820c02a4544
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a credential phishing lure. It contains embedded JavaScript and multiple external URIs, including one pointing to 'philabc.ru/uplcv' which is likely used to redirect the user to a malicious site. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=download+apk+authenticator PDF link annotation
    • https://censcakmu.org/board/file/files/57186748701.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/zefofafijisepab.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/gunamojos.pdfIn PDF document text
    • http://firegallery.ru/img/upload/35437746051.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/72156769447.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/36627029627.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/pozufus.pdfIn PDF document text
    • http://vucert.vn/uploads/files/modarenujiva.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/ligix.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/gureloviwalukoso.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/11319033649.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/63082008539.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/sozikavofibifu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33479586908ed2ffcf039dd98dbc54a8/jetivomemuxasuxesix.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/14927222810.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/11181809547.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/veximurokuxerun.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/31709773419.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/tubedokuvofurepakunutad.pdfIn PDF document text
    • http://arucax.am/user_images/file/64750578261.pdfIn PDF document text
    • http://taigesw.com/upload/files/43772698506.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/80845338440.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/71985711635.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69075b25e---vopuvobezaxep.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_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 17364 bytes
SHA-256: 73a8c446d7f0445e4071ef2799150510b71ed079d433f8bdbab575998f52ad98
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10724 bytes
SHA-256: 0552a9ab0388358a0c2f2101ec850e190fcc46cf2e27993125ae8e28efa35069
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1