Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b8bd8a960fef0e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 02:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e85a2f8341e9f39bff6a902e0832e3b SHA-1: 09916a3bccc34e5db820d66f8ffd5bb894ce43d5 SHA-256: a7b8bd8a960fef0e734f99f7db407bf5eb46b7eddc9983946a7d7e2533e0a9f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting it's part of an SEO link farm or a mechanism to distribute further malicious content. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful websites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wb?keyword=rules%20cynthia%20lord%20theme
    • https://cdn.sqhk.co/wugeguxu/1dIiche/fresh_from_the_sea_restaurant.pdf
    • https://cdn.sqhk.co/matejedu/ViaBDgg/lonamurefafavep.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_604f5220cae9a.pdf
    • https://cdn.sqhk.co/tujuvemevo/ghBZgcm/hitman_3_ps5_upgrade.pdf
    • https://cdn.sqhk.co/pirujezexod/hjge2jg/wazexujisuxinuk.pdf
    • https://cdn-cms.f-static.net/uploads/4426814/normal_604a21cea7eb0.pdf
    • https://cdn-cms.f-static.net/uploads/4384143/normal_604b87adb3e8b.pdf
    • https://cdn.sqhk.co/kutagigixef/iHhfha3/cv_template_free_online_uk.pdf
    • https://cdn.sqhk.co/xunijejozi/jhgjT3J/82216724574.pdf
    • https://static.s123-cdn-static.com/uploads/4470980/normal_6001e166c2f27.pdf
    • https://static.s123-cdn-static.com/uploads/4455396/normal_6001090fca3ea.pdf
    • https://cdn.sqhk.co/dunokufimove/9jaZlAM/55010732939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_2eb3fb3d8f8c42909394a30745e513f3.pdf?index=true
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_05720b08c72845129269102b7e3335fb.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_c0a12ff97b544aa39e165b266a7b580c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed089681-d6ea-4798-a35c-3b42e0d27da1/the_island_of_dr_moreau_chapter_19_summary.pdf
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_cb0c112d3c8048e1b77e08643e25038f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69189676-20c7-4dbf-bca2-1d2adaba1f4f/adobe_indesign_cc_classroom_in_a_book_2nd_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5db.bin
e0888035c1500eef37d0ad858b233da26fbb17f3dcdcf8f8cbb71309bae571d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 5288 bytes
font_01_sfnt_off000107b5.bin
594f62295afe721cb4e4339245d76a43c551bed3a6949137ead0388ce7109c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 11292 bytes

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