Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e5ccd38cec312a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 07:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c4a373c2f1e3da055ce70fdaea001f2 SHA-1: b921e8d54a2fc81a7dece61805809d3aac42dde7 SHA-256: e5e5ccd38cec312a29d2b5cbd0d07e09bb9c85e59e830b9f492809102612e0ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files hosted on various domains, many of which appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kalimati.in/userfiles/file/26128349904.pdf In PDF document text
    • http://bienbao.net/uploads/files/20805409461.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/43073424394.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/sumugofedonumiz.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/zinawa.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/rawujeter.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/36368674663.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/44359684303.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/43461847247.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49d1497d9---8114186748.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/lerujanovibanune.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/gosub.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kopuvelemuwe.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/21183893144.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16143973c1f4fb---zanoxojapubi.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pasativozakijepejotomizu.pdfIn PDF document text
    • https://funbugs.ie/files/file/xipowunuw.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/97821829557.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/kuvofom.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/84733824498.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/mutod.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/10154547397.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/80834521601.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/58769566541.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/5376153473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chat+room+apps+for+androidPDF 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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16340 bytes
SHA-256: 624350d2b896634f8ed417e0a9d3af2e1dfbc5f84b1aeeb319298fe626496aea
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10616 bytes
SHA-256: 4a215aaf0e983317c01c899bdbae34a794a5d0f3ab061cea7b0ce95aa9c313c7

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