Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86859a799ebfb6c…

MALICIOUS

PDF

96.8 KB Created: 2021-04-03 11:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef4d7383d390e2b72d32068b1941181 SHA-1: 47af285201cc5a13f66453f9c03f16d630e64b69 SHA-256: a86859a799ebfb6cba0137006957c7299de4639a087fb4e6f38f2c97a0f4325f
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large number of linked PDFs, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of external URIs and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8333

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://dafemum.ru/award?keyword=tibetan+buddhist+mantras+pdf
    • http://grenkasalo4.xyz/897934000647roqp.pdf
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcbac92227ee.pdf
    • https://cdn-cms.f-static.net/uploads/4421468/normal_603ddf1bee639.pdf
    • https://cdn.sqhk.co/xevowuto/blhdghF/toca_builders_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fe82f4455fa8.pdf
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/5e16fefc19fab77.pdf
    • https://cdn.sqhk.co/wokinuge/jjieMmp/free_student_attendance_tracker_app.pdf
    • http://all-casino.xyz/prevent_form_submit_on_button_click6gwv6.pdf
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/wasusobasitix-jozodebumewadi-rinegirub-guwitagib.pdf
    • https://cdn.sqhk.co/fadejiweruw/ahijhLk/final_heroes_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4474985/normal_60400bd40a4f2.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/zoladuj_lizixazipilazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_58bb8f87602b45b680b86d73a5adb4d8.pdf?index=true
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_e5ce04ee5036431faf9023c2a8d2355c.pdf?index=true
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_9c9f068438ad4002bac5520c8c30c9e7.pdf?index=true
    • http://zefinut.rf.gd/19475608020.pdf
    • http://wikatamuk.rf.gd/scrivener_3_android.pdf
    • http://povemuxituziv.epizy.com/wukeraxuzip.pdf
    • http://dapizifotokom.epizy.com/4548492814.pdf
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_dc77419b1b84440c8d86178d0265c771.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_e73072097b08425cb7cc7090033ada45.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014427.bin
8400bfcb5a916dee3e8b92dd83527e1a658d7eca470406a997b7ea120c255146
pdf-font-stream PDF embedded font (sfnt) at offset 0x14427 9088 bytes
font_01_sfnt_off000162b8.bin
b66de0ed902e18245a724560d53716e8e0bedda6015cf6b5309b4bb161ad9462
pdf-font-stream PDF embedded font (sfnt) at offset 0x162B8 5108 bytes
font_02_sfnt_off000173cd.bin
9123a1c4da111a845aa5fa8204a969b8e324c5c5105770c66282dcacc97015c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x173CD 4472 bytes