Malicious PDF — malware analysis report

Static analysis result for SHA-256 687ce0fe48d440cf…

MALICIOUS

PDF

81.0 KB Created: 2021-03-20 05:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4091b8674fa6c73df55d45c6a11a95b SHA-1: 5b5fde8379f116c8f1287c2422f2c19a0ab0d681 SHA-256: 687ce0fe48d440cfb1d6201deda5848959a175c08bae81810fb9abb8e1a3569e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a browser extension installation lure and a download button suggests a social engineering attack aimed at tricking the user into downloading a payload. The embedded URL points to a resource that could be used to host or deliver this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=gstr+9a+annual+return+pdf
    • https://cdn.sqhk.co/fakomuse/0Mihvgd/uba_mobile_banking_transfer_code.pdf
    • https://cdn-cms.f-static.net/uploads/4489259/normal_6011311164e55.pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fd7d302ce20b.pdf
    • https://static.s123-cdn-static.com/uploads/4371246/normal_6008cfabb76c0.pdf
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fe3e7bb50c44.pdf
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5ff3bd22bf2ee.pdf
    • http://bumumapa.mypressonline.com/complete_metric_space_examples.pdf
    • https://cdn.sqhk.co/xovatagemi/ByhiiiH/gartner_supply_chain_symposium_2019.pdf
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5feccea3df19a.pdf
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5fd877d09acac.pdf
    • http://fibipowokogo.sportsontheweb.net/how_to_get_out_of_a_contract_marriage.pdf
    • http://figimumagoko.mygamesonline.org/master_cleanse_daily_recipe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00296b5f-0adb-4459-90ad-51dc7ca23a2b/pakistan_studies_mcqs_for_class_9_in_urdu.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_48bab68ef34e46c3b14a5366d7f7401e.pdf?index=true
    • http://sawesupunozigiv.atwebpages.com/how_to_garden_vegetables_at_home.pdf
    • https://uploads.strikinglycdn.com/files/bb1f90d2-15f3-4677-8e56-8193101640af/ti-89_titanium_rom_android.pdf
    • https://uploads.strikinglycdn.com/files/b7d8d0cf-63e5-452c-94c0-a5d8e0dcba04/cinderella_story_book.pdf
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_5ce1c52839534f8ab02c086b8c9fa386.pdf?index=true
    • http://tebuwawezizafes.onlinewebshop.net/26567843326.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_a0fda8f4629648d6a94a32fc5b2a4920.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff23.bin
d385ee3394695e527a9db7518ad87e80b4ddfc33c06120786aee63d1133fa1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 5224 bytes
font_01_sfnt_off000110f6.bin
54807a773f4020cebfc69f1d9b93aa6746ff11ca077683809447987b0cb17fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 11192 bytes

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