Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b249047168e13d8…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 14:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db41b2a795831c173e34fb4d14d12bdc SHA-1: dc1145b14cffaacd7507459b423fbb623c458488 SHA-256: 4b249047168e13d87918e69c67766f58be7ebf7d84d1e95f3cfb4f6df98006ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on disposable hosting, suggests a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a lure for downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://le-nora.com/userfiles/file/romaz.pdf In PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/zugojajorupar.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/59700099545.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/2399903155.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912075202.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/26680642092.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/luxika.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1c02300468e6460332db00549c733978/4117332271.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/vizozekenasifokumazijuf.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/tegara.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/62312721143.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/40196790572.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/mugutezifazoduri.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/10467035011.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/fuvovu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/pozoja.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/77306381088.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///masitegetewenifel.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kulaxivinon.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/53262777456.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zenevowavetovizakek.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/rolez.pdfIn PDF document text
    • http://www.celso.org/download/1949524237.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/76033294892.pdfIn PDF document text
    • http://erdbau-rauch.at/foxebixuzovizu.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/1000861410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=install+marvel+contest+of+championsPDF 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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 10764 bytes
SHA-256: b667c5a5e5308d9956991c4366fc21daf9b5e9d5d00c2582761033a563d17fe9
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 18180 bytes
SHA-256: c17606ba2391e9a87ee3bb7ca1642ccf54da24f38b41096a5d35a1420e93c3bf
font_02_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1