Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66e8ca844e99dea…

MALICIOUS

PDF

91.4 KB Created: 2021-09-11 05:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18cf46f50655ba336d938af4ef3953af SHA-1: 75cd752a3091e42b265e1462a23c2f42b7a4490d SHA-256: a66e8ca844e99deac0b03ad66fa495f57d307166e524ed179fd6b723fab2b389
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. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term=enter+code+robux' in one URL hints at a possible lure related to gaming or virtual currency, often used in phishing scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://stomatoloska-ordinacija-rijeka.com/files/28656983635.pdf In PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/92889808684.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/68212350870.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/69598906787.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/51016187242.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/25608077183.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c36e968dcf2b8230ddae274615afc7b4/37548977669.pdfIn PDF document text
    • http://digifast.cz/userfiles/72203824903.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/52686318868.pdfIn PDF document text
    • http://candientuvibra.com/images/file/4050694018.pdfIn PDF document text
    • http://packamate.com/userfiles/40396194624.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57313481615.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138620b5a78d---potusilurupopubefizak.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/2593444688.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/08/banepebilijow.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/suravita.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/30040972390.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/75128706298.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/zumezajemimovorudak.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/38537381294.pdfIn PDF document text
    • https://tch.lu/files/files/55322653817.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vilarex.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210911_C43CF46B5917F9F3.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/33588013632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=enter+code+robuxPDF 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_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 18292 bytes
SHA-256: 323f4f448dcc39ae531bf0d370ffe7c80524eedb76f078e07075fe3c1c08f5ba
font_01_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 10220 bytes
SHA-256: e2f1edab155817a9f5422bd66c4b7b9193f2216b7342ee5c7e08630cb59bc581
font_02_sfnt_off0001487a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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