Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b1be3085223a86…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 17:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48038a98ebecac5cf7ce5c4cae2fb906 SHA-1: df63a2e11eddcd436f7b8f17e60a52d9e6b0b0ed SHA-256: 60b1be3085223a8678f6ce7c8715840db476c249a5737fa1adb3147cad43b7d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.institutvzdelavani.cz/files/ridagetujituz.pdf In PDF document text
    • http://a1-automotivegroup.com/upload/files/11362431998.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/89967109418.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/zitad.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/5419549767.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c4fefc19---75665012429.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/14373320301.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/satejitudibulazunazorebux.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/kikagogupulelo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/19422959948.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/jipadutizuvivixa.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xufufofaf.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sawaxaxevevuleda.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/66592583828.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/4993713887.pdfIn PDF document text
    • http://wernitznigg.at/files/jaselajebovuzifumoxanuve.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/48053419655.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/27063306898.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/ripiz.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/19989790129.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/13060896016.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/mafugafedarowazivobafixaw.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/26904138631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=indian+national+anthem+in+kannadaPDF 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_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 17108 bytes
SHA-256: 4748c2f53c6ca280146901a0c35f1276a90e8a87edd5fd18936c973d2f870997
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10288 bytes
SHA-256: 31ca2ed0b42997d18f32cb98c74c2e186b529ec2d2633198c469c1709c9a3a53
font_02_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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