Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccd58888c80c92d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 07:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1913744c6bf4391883cd63a8e512fcb3 SHA-1: 5c92de6783dfd6de018b46f8de51b382cd8bc8e6 SHA-256: 8ccd58888c80c92da428042b9f5b12cc7dc4368cea15f231492df5d19aafa76b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://studio5r.com/userfiles/files/43050367170.pdf In PDF document text
    • http://emblem4home.com/UserFiles/Member/File/taxujujevowajojuviw.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pinuzed.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/47190404442.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090410150256.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56644268128.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/30793469827.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/tirufi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/nilulatevawopazosipo.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/jilazapaziluvijevowim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e07ce9076---98422063769.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wukupurosatatapuxono.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///guwejuzituratamavu.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/25279414784.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/xuxozofobijoluwajekafu.pdfIn PDF document text
    • http://liluby.com/upload/file/67910098648.pdfIn PDF document text
    • https://razredna-nastava.net/files/21205755375.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/69604638604.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/meriworebosavulozolo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/vuzasarexera.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/5411134004.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/jiwozebu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xugijogufariwavepufogewu.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/32009556905.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/36084627596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=iptv+cast+apkPDF 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_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 18056 bytes
SHA-256: 662570f03c06b1566fd416c29efea2128e7ba7683027e53000adbb7d2283ed91
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 9884 bytes
SHA-256: 3c5c35b173dde2052780f8ff2c874de3c3079df7ca1e5bd3cae1b1f4260d2054
font_02_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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