Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec12efb52ff9e7a…

MALICIOUS

PDF

73.0 KB Created: 2021-03-10 08:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8344d606066764e1993b610ea6b3a888 SHA-1: 93eee10f0e97ecb80f2508e49920cc76f7e99a6d SHA-256: 4ec12efb52ff9e7ae8bae2818c9c2f7418ba4e345b8bc43f8df69cc89b8032f3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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 https://soxebez.ru/wix?keyword=godzilla+vs.+biollante+%2528blu-ray+%252B+dvd%2529 PDF link annotation
    • http://women-ita.space/keveganupagixerenegakesincxp96.pdfIn PDF document text
    • http://foxutizu.22web.org/pososu.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/ihgeTgi/zombie_football_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/xoluxuroku/SbmKa0o/51710089796.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/xTibhbL/63641033396.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/igjghbM/zurukexoninufi.pdfIn PDF document text
    • http://ejinaya.com/5946346898v1qvb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4378d99-e544-4e40-adc7-f79a4ff4df22/33075496472.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_790cd552267e4a3fac72a16e6ed97303.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bf1c6d-f175-401e-b45a-7b699ab14379/best_app_to_learn_chinese_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70efd24d-f6ab-4329-b367-7aa004f294b7/65819629133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0837b359-2235-43eb-b704-b941755d1a5d/puzuxukesofagiwivule.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_e6f007728e914386b6b885fb767bba4d.pdf?index=trueIn PDF document text
    • http://muvidunijusen.rf.gd/96012933289.pdfIn PDF document text
    • http://jatojitax.rf.gd/89474369375.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_77931542386d4cd997e10881021aedf1.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_99958bf990f743ff933a27b0a4dffc79.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_ea9e72f3ff2a4588b265fa51ad94019e.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_f760d77028c5401ba46d4ffa923e3af6.pdf?index=trueIn PDF document text
    • http://golofupatawef.epizy.com/african_football_song_waka_waka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6581d10-a211-40ea-845c-2085589c49e4/halo_2_setup.exe_free_download.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 5420 bytes
SHA-256: 76fd49b51b5a18de255e4f73cad1d96b6426e6aea811c15d7b8b65b992ef3c09
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10156 bytes
SHA-256: 42605152677a97d192ae150c2e82fbda989299d680aed94a31940c4044bf7424

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