Malicious PDF — malware analysis report

Static analysis result for SHA-256 df57a553ec80ce91…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 20:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45c2c314eb99b9467033070763a7ae8a SHA-1: cbac8d98f352f3ce48a926c12b28b3d19e0edc28 SHA-256: df57a553ec80ce911972f1ef5d90f6e131440940e6117ebd2afd042f60604007
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous distinct domains pointing to PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unitec-egypt.net/userfiles/file/86918590641.pdf In PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/72406050888.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/6284273422.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///83058129141.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43430131710.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/79630871814.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/bapad.pdfIn PDF document text
    • http://chromavials.com/d/files/33143413208.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/luvepusixal.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/solalododewuk.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/58252021373.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/84901491483.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8350817726.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/84546037056.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/45173948261.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/38480488572.pdfIn PDF document text
    • http://abnicum.com/files/file/wiworerarumabexanetumofa.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0934003001630548131.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/34289951978.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38540277603.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613694fc3432f---meworomowusuguguv.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced544c58e---46761349337.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/72652477664.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/papuzojirudozozuduna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oxford+junior+english+grammar+by+rk+sinha+solution+pdf+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_off0000b731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB731 15896 bytes
SHA-256: 89c915d6801c2dbb8229f85612ec3d3fd48a61b214be037e7fdfa92851039bdf
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 11732 bytes
SHA-256: efe35ed1cd5bd2b5d116903d2696031bca7047b7f0dc68d928cfdef4288ee881

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