Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5853b168e953de…

MALICIOUS

PDF

67.2 KB Created: 2021-09-17 01:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7d460ada6876052b63fed5e629861c52 SHA-1: b446e4bb9bb679a719f9e126784952f774d3f472 SHA-256: ef5853b168e953dea8599f61af743632f433ef408d3fac2ce2cade2999106094
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://spain-ex.com/images/blog/file/67985290719.pdf In PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/magimoligonemor.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/kaxamewigufo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/begixud.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/75721169343.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/57156836209.pdfIn PDF document text
    • http://huiking.cn/uploads/file/090446439789.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93688275736.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/wavenozokivaganosuke.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/tikugololep.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/morusez.pdfIn PDF document text
    • http://schokozentrale.de/idata/86990238817.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zenaxeg.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161429d560f5bf---86673155268.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305049af605---detegizodeseruvo.pdfIn PDF document text
    • http://gespk.com/userfiles/file/patuvawomuzepugo.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/virisivigasotaze.pdfIn PDF document text
    • http://findusafranchise.com/files/files/porijedo.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/repogoxeruwunebup.pdfIn PDF document text
    • http://newcityhk.com/userfiles/84012630934.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/peboxaximanimagaloxezejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+bollywood+songs+on+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_off0000ac7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7C 14204 bytes
SHA-256: e0dab2900037523f1f2707f34d61ad413724dc958125819f87ac80384a0d31b8
font_01_sfnt_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 10532 bytes
SHA-256: 915c7a5876c8becd6a5713873a5b3fcb0e2dfb81744eaccc7d3e0c714272cec8
font_02_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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