Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef11b0388ad750a6…

MALICIOUS

PDF

85.2 KB Created: 2021-03-10 06:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed221bced433aba4a2510f32bb6dca12 SHA-1: 357c46e9c703e04af4eb90c32ef1edba80e05ba8 SHA-256: ef11b0388ad750a6b15e7fc811ede17bffa4213a3f9fdb68df9fa5a62dce2047
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier assigned a high probability of maliciousness. An external URI heuristic identified a URL pointing to 'maypoin.ru', which is likely part of the phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://cdn.sqhk.co/simikitivo/ibhhTVy/vaferadaxonene.pdf
    • http://zejizeb.22web.org/16507146342.pdf
    • https://cdn.sqhk.co/nozesinipi/BnghZUV/xuniluwuxinotududelobuvij.pdf
    • https://cdn.sqhk.co/kitaparek/YgWiiic/togibux.pdf
    • http://lp-consalt.ru/git_command_list_current_branchvye62.pdf
    • http://cetakchantek.com/acca_june_2021_exam_datesubsfk.pdf
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/gafopupotavedep.pdf
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/gugilubesolumawabeb.pdf
    • http://lighterusb24.site/74416461176185sd.pdf
    • http://teksol.xyz/17364650073qwkvn.pdf
    • https://maypoin.ru/wb?keyword=business%20statistics%20
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pubamawuxa.epizy.com/fidupasiwozareke.pdf
    • https://uploads.strikinglycdn.com/files/4a9a214b-e54b-45ff-a619-931bcf7bfe5f/53828902959.pdf
    • https://uploads.strikinglycdn.com/files/65f7cb6b-f3e0-4a0f-86df-d5bb46034dea/a_dolls_house_summary_act_1.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_d98ee0a97a4d43ada258ab2535f58eb0.pdf?index=true
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_88259fa6d672475ca262c71c508465f8.pdf?index=true
    • http://sulosaseg.rf.gd/jisedotodiwamesifepisime.pdf
    • http://zutawatupasexap.rf.gd/petaluma_junior_high_school_bell_schedule.pdf
    • http://nuforikoxiv.epizy.com/craftsman_109_lathe_tailstock_taper.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_off00010fae.bin
48233779146c6ae5005e575460aa2c69254dbffc5cc9f53e70cef152244071a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 5484 bytes
font_01_sfnt_off00012278.bin
60b49f939a10acc9153e0dea98f21e67f48f9aa7e3fd6e62737593b1ce5b2466
pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 10840 bytes