Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9b162df0ecd427…

MALICIOUS

PDF

118.6 KB Created: 2021-09-13 16:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 004e49d5e3d21afbc6b76ebae76678d2 SHA-1: e754546e082e4b6ddfd505d5d4e64c0be705bbae SHA-256: 0b9b162df0ecd4278eead816e6ad2f63fefa1735d44123f7d8fc9868c584a5b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=papyrus+plush+easter+egg PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/11636971174.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/75384356666.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/namajutisajes.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/vedubukivuvodopipoxovuta.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/tuxenarupi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zivikopepinosine.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/karar.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/zegavivulozizotadasonita.pdfIn PDF document text
    • http://rem-proekt.com/f/file/kizitaxikowoguw.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/lifirizunuroferekur.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/12010901530.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/90921262421.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mutosobosurul.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/84547851874.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/14565735659.pdfIn PDF document text
    • http://seamacros.com/upload/file/dotularo.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/sebulibenarupirosinud.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/gomemabixuzibixavugaxax.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/nutewijov.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/losurufan.pdfIn PDF document text
    • https://satesayap.com/contents/files/nadagubuda.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/71157435820.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/tuguxakej.pdfIn PDF document text
    • 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_off000163e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E6 21464 bytes
SHA-256: 0eb87b4726ae91be823ef13d7621355833d95221404090ea35b2b204cefda649
font_01_sfnt_off00019c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B47B 10432 bytes
SHA-256: 43eade8ce3b4b9298da7fd95486bdf5a152874d093682f05bcdb6f07ed220715

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