Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2bb11343a80746…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 00:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1de8b94d91582fcf0ec0b37f2c8ab58b SHA-1: 54b82ca42b92860f18fc52e0ced98544b2228d55 SHA-256: df2bb11343a80746ca1742e35f91514e64339346975540ef8b16f4684805175a
134 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abwlargo.com/uploads/files/mojilobafakebosutimupu.pdf In PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97328676151.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/88732850795.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l73bhv0up3v5uotsja2svoah2o/juridelefetozonovaxazivaj.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/ramegeruwezufuv.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/35051531632.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/zimurusimesupikuwokeb.pdfIn PDF document text
    • https://basisangka.com/contents/files/xuvujimi.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/43772711152.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-15/20210915185721656253.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/ferofexurozom.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/15386940383.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/tekixulaxugom.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jitaxugutivaji.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/39335375950.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/3219918111.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wadogebarijajaminimavupa.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/73186472177.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/sukakemejokixukewa.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/sofowefotu.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/31436359138.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/deriresixedupajov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=any+video+converter+professional+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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 16756 bytes
SHA-256: 5820067d9c95e4ab3aed4ff559ad9114ab2b796ecdc378a33c209a2a36ec2ab0
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10860 bytes
SHA-256: 4a70f699da8ee495f434107524e0cb7ea99a04116a9878130d5d41a0d0da9872
font_02_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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