Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d31d63b8b7feb9…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 06:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4acf404c4595d68dd2a0fd3c0d006af SHA-1: b7e901f24e11155dc8b435af762ed3a29ae810ce SHA-256: d3d31d63b8b7feb923b5511838ad43742fe5c4af2ee362101e6ad384b7b85d20
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 payload. The presence of numerous links to disposable domains suggests a link farm designed to obscure the ultimate destination of the user. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://brenno-tojestto.pl/userfiles/file/17675348135.pdf In PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gesuti.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/22d484fcc9b78da6b91b56e4bd9a8c71/68343222170.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/48152702815.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/tolizelodegesemake.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/13631830225.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/kogetefopawenolijoro.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/22302192019.pdfIn PDF document text
    • https://birotex.rs/images/files/bemovin.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/mexuzu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/95610525425.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/88429500544.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210902_856356DF917BCEA3.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/76993416935.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6ba6031da47750489d2e0143c07e9dd9/27716420838.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/63284335614.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/30033065548.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zotidivolalovodajuxe.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xamiwitamu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/teganukaxomemukinirebetow.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/82028244936.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/38787837128.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/18812638706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=shahid+vip+app+downloadPDF 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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 10216 bytes
SHA-256: 90c8df72fef7364b5c149f5667e26c631756bbbe037611091de8fc9e87e698f2
font_02_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 16392 bytes
SHA-256: 0ebd0bde39d420eda83f701152614c641138f5baf4bc8f889e1bd502381e3433