Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d99e9c37e6603ef…

MALICIOUS

PDF

72.0 KB Created: 2021-04-04 22:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d7a55f47f3712fd29cce8faae35fa8 SHA-1: 225490d4325e6af51c366ecb4b98a521ffe3fe90 SHA-256: 5d99e9c37e6603ef9c96eed65bfd7cbc75ae3b5da14d849001721c73fcbb0acf
154 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 high likelihood of malicious intent. It contains a large number of external links, many pointing to potentially malicious domains, suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to medical treatment, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 4

  • 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
  • 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://golowaki.ru/award?keyword=edema+cerebral+tratamiento+pdf
    • http://philonio.online/rorubimujejizojktqn.pdf
    • http://alcexpress1.xyz/cuales_son_las_causas_de_vertigo9q9vz.pdf
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/neris-kiviliponomil.pdf
    • http://insta-sale.site/vevadekavalidijobukojfxht.pdf
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/logumejurebefimu.pdf
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/8101f1c4b24a4.pdf
    • http://suvolupijiro.mygamesonline.org/63025776369.pdf
    • https://witaretazijaw.weebly.com/uploads/1/3/0/8/130813730/ecd6da1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_842bd1ccc11447f586d41dab3e0dba3e.pdf?index=true
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_5f702c75efee490f9003f3d431a69742.pdf?index=true
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_68c9414236024fd389d1fcea4d106c64.pdf?index=true
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_f5eb903aa42e4a3eadeb15cd2688a577.pdf?index=true
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_aa8f6e2e38104d2ca62a48634c142daf.pdf?index=true
    • http://keregimuw.onlinewebshop.net/toxuxixowow.pdf
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_f58ebd45ee0b4088b01a94cacb584157.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_7cfadcb9d0bf45488389a18a85ca3ee2.pdf?index=true
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_709af8b694d84497abe9fec05d15c4d0.pdf?index=true
    • http://todifisafi.atwebpages.com/up_bed_syllabus_2020.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_25373a066b734917ae6324d4e8e0a0c9.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba7.bin
4713d1e9ba1d88122763b2a14ce35f0eaccf010f2bf593944fd4f4a69dd29b58
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5220 bytes
font_01_sfnt_off0000fd4d.bin
4c2fc301c4d8959c2115066beb12052cd23e2800376cd9d2a3d2b5f0ca7d7647
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 11692 bytes