Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f39a1544057ec40…

MALICIOUS

PDF

94.4 KB Created: 2021-08-19 06:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 572e6a9933892a706a2f7c7d3674cc78 SHA-1: d68b215ec3b55323d22b52b305324494276ba37c SHA-256: 5f39a1544057ec401c09a39145ef227549b35bd74338df9290e3c69784ffe72c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The presence of embedded URIs and the overall structure suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://bwawarszawa.pl/upload/file/13504339666.pdf In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/33713035635.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mukarulelutupilo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaa6a3f58---7914405323.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/matisezo.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/tidopivoroke.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/54628543622.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/64525486201.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/1899743414.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/14876008259.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/50586976082.pdfIn PDF document text
    • https://kede.org/userfiles/file/sodivozekibibamox.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/95675802470.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xipeloruzawaxosub.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/6668419190.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/2115071337.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/90496360445.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/25166790091.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/kukolavilolaboduzedudumok.pdfIn PDF document text
    • http://beiks.info/public/file/ninadanewiselovosew.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/newojujulukuvaxewirojixos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=libreto+pastorela+comica+cortaPDF 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_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10528 bytes
SHA-256: 4051b78e5eb4159194166ee11b02cccb547d774b191c730dbcc58ad1e4592257
font_01_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 18588 bytes
SHA-256: 9faa8283732580c1c2a05d208c11d0babca39cf28607b6071bb251df8f310fa4

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