Malicious PDF — malware analysis report

Static analysis result for SHA-256 135693c3bd98a2c6…

MALICIOUS

PDF

97.1 KB Created: 2021-09-13 07:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ac56bc1c0886e603a17066d50f76f39 SHA-1: 7f10da1d01954a448624e374766bbf3fecdfb4cf SHA-256: 135693c3bd98a2c608da533753d493d92ccff0960554c838b67625430fcfc6f0
134 Risk Score

Malware Insights

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

The PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including one identified as a link farm on disposable hosting, suggests the document is designed to redirect users to malicious sites or facilitate the download of additional payloads. The primary attack vector is likely spearphishing, with the PDF serving as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.
  • 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 http://moneymaker-gold.de/files/20954244268.pdf In PDF document text
    • https://gazeta-msp.pl/user_files/File/newinipekupelulena.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/kadobusobejav.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/39378808809.pdfIn PDF document text
    • http://ipublicity.cz/data/file/lovifatafogowasali.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/datarowalaterodulutidu.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/bimuxuwosozufogosut.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/sonifixonoz.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/pudezudowanalote.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/pekefipifexexu.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/pafukikazatawafajeg.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/58795249028.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/43850144361.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/mijufanevikasonigimenu.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/bititujakodorifakidalome.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzitifumi.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/wugidanozedavopugodisabu.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/xoniridudibefozejadexis.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/roleso.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/larurejamu.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/xosamofujisulakonenupi.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/24022612032.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/58113369520.pdfIn PDF document text
    • https://clickbox.ro/images/file/xonaruwujutugo.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/24272810045.pdfIn PDF document text
    • https://diphong.com/uploads/rigafebenidowogudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=send+email+on+button+click+htmlPDF 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_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 10772 bytes
SHA-256: 4887ed2e0b2c44d3a8416d1adadad8b55f3a05d27b023f1c0632fdce0a3d2f92
font_02_sfnt_off000143e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E2 19048 bytes
SHA-256: 63b4bf30aba45119655cd93b2943ea3778c3f0bfa29a7c1bb7e17ac6ecc63824