Malicious PDF — malware analysis report

Static analysis result for SHA-256 117f518913d0e399…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 01:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0236029d44f45b7b7342fb51699f5c6c SHA-1: 9b6edb3221b6b86422b77f0e284e12ca91994451 SHA-256: 117f518913d0e399e4bef531981983eafe43c2a00dd4e52d050dc28ab353136b
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 phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm, with one specific URL identified as a potential redirector. The presence of these links suggests an attempt to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://langeline.com/ckeditor/upload/files/77857633405.pdf In PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/7741450220.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/panemimeniguket.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/susuwusebosulalos.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/92464722377.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/riparimukemonu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/0301037887.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/ribavigevinuzodubipuz.pdfIn PDF document text
    • https://ka-base.no/images_students/files/luwebulajekuveketomepok.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/2997951314.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/kulosumewume.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3957eb7a76b41dc271137a06165e3c43/30853700438.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/zefogij.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/migamutupuwu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2938128743.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/15368841406.pdfIn PDF document text
    • http://cecev.com/stockages/files/xikoluketajokafil.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/nutefi.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/4646446557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+hacked+temple+run+2PDF 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_off0000a9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E2 10916 bytes
SHA-256: 413a221bda9c40c24ba4e12289e23468205b4319259573858a6e8180b7fc1df9
font_01_sfnt_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16680 bytes
SHA-256: 1b1a9a73f33749a43e8ef58b163787e3091fc5adfe5e7f89a982facbfacc7d37

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