Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bb115d83e6563d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 13:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d7d6491e4f3a5c4a6e39d7412163d2a SHA-1: fe7f64579c2e2cf4b93c344c5103efbbf05925cd SHA-256: 78bb115d83e6563dd9c7373786a6a235f1f5c77cbb01bcebbcce4af3c2b25d0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristics identified it as a link farm with disposable hosting, and it contains numerous embedded URLs, one of which is presented as an 'android 7 download for tablet'. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://festival-bg.com/media/ckuploads/files/bigunapafirilu.pdf In PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/21979585503.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/58276539326.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/pexilozunupigo.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/87431984341.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109120751305023.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/40132503866.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/90533140489.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/44232216703.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0488c3963---modabunerafuderuvugimo.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/35300254739.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/22004157113.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/6719084611.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/56833781191.pdfIn PDF document text
    • https://korankertas.com/contents/files/valatexejufuzaduxakal.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/sixivuvi.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/dolapiveduxenevezogugul.pdfIn PDF document text
    • http://synergyproperty.com/images/files/44499633440.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/voriperukid.pdfIn PDF document text
    • https://quizai.com/uploads/files/83450816539.pdfIn PDF document text
    • http://favourtec.com/attachment/file/bunerutusoxepeloduboloki.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/viwalebuginikaramaramexa.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/44495449920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+7+download+for+tabletPDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 14392 bytes
SHA-256: 39bb3ab31dd4ca545aea3595bcfe99f90c72c8f1cb03d3136ea7443ba8f38d1d
font_01_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 10436 bytes
SHA-256: 874214c35d733def48db59b3d6269d0b08ec3362265c881bc16a1e9231e23c03
font_02_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1