Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5359d30323e43b…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 11:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72f5d86e7b6c997bb1c8944575c5a4b3 SHA-1: 2886430adf5384a7345615fafb4acd66611e68ee SHA-256: ff5359d30323e43bddb0909c27ba754d589d4228445f898397abc20eebb48fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or redirection scheme, likely involving embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+use+pump+in+style+advanced+breastpump
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/govaf.pdf
    • https://cdn.sqhk.co/tumowara/jjdihuM/fallout_shelter_online_download_android.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/zizabebedavupowinevi.pdf
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/a88a3ae7636a.pdf
    • https://cdn.sqhk.co/tivinarafuvu/o9WUghb/when_do_water_parks_open_in_orlando.pdf
    • https://cdn.sqhk.co/fegozanodedu/ciexnid/nonuvobinefimobomaz.pdf
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/4f34e3dd5df.pdf
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/b178dd4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jezaxojipevu/tajatemefekaxe.pdf
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_4889bbc7337b4b5c915130558df2b966.pdf?index=true
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_c0cba9899f154c72b0d02a24afea8b42.pdf?index=true
    • https://s3.amazonaws.com/kufazete/addition_and_subtraction_of_dissimilar_fractions_worksheets.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_af6e8fca67be4c05bfa27ef4819d7978.pdf?index=true
    • https://s3.amazonaws.com/vanatul/biztalk_server_2010_installation_guide.pdf
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_cdf1404528004d139dbe91cdba476d40.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_662335c563cd4c6a905700e2243a7163.pdf?index=true
    • https://s3.amazonaws.com/donarepemi/583035293.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec11.bin
c43eefc6a1eb24b5643a5c57385f279f4be0f3f6dfe3270618a8dbef0a84c7da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 5456 bytes
font_01_sfnt_off0000fe95.bin
f9368233169ad233fac265c7afd112093a887843dcf3a3d8fde8c9abc37918fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10492 bytes
font_02_sfnt_off00012277.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 4324 bytes

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