Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7a99a2e8cd828a…

MALICIOUS

PDF

82.9 KB Created: 2021-03-16 04:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7feb0894acb7878e6f10c88ee3d0a69f SHA-1: e9fa7a8b7628edee471460b4faa5f07df828597b SHA-256: ed7a99a2e8cd828a84f9d5a81a5fa55be147e113c36d34eb69af2981ca33f23c
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution attempt, potentially using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/award?keyword=afrontamiento+concepto+pdf
    • https://cdn.sqhk.co/jigijobofofa/l5iczgc/weighted_tuning_forks_sound_healing.pdf
    • https://xisidugaboker.weebly.com/uploads/1/3/4/4/134436298/969713.pdf
    • http://miwipagodu.22web.org/murit.pdf
    • https://cdn.sqhk.co/kubemuzu/e2j0Xrt/fish_ohio_striped_bass.pdf
    • https://cdn.sqhk.co/xubuzivo/cheKib0/metal_slug_defense_apk_mod_1._46._0.pdf
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/zafekezalitoralife.pdf
    • https://cdn.sqhk.co/vokalater/qcihhgs/simsimi_apk_old_version.pdf
    • http://kirivil.iblogger.org/centurylink_prism_app.pdf
    • https://cdn.sqhk.co/tinolaseja/jgoEyRh/jaguar_bohemia_ringtone_download.pdf
    • https://cdn.sqhk.co/tatidukigag/nDijoig/free_download_city_island_airport_2_mod_apk.pdf
    • https://cdn.sqhk.co/gixelotopa/fhfwhiH/suratugog.pdf
    • https://cdn.sqhk.co/zasokolof/W6jhgcW/guide_for_bigo_live_lite_streaming_app.pdf
    • https://cdn.sqhk.co/lajefage/Jheca1D/teachers_day_2020.pdf
    • https://cdn.sqhk.co/nakizenonetu/othhihN/adding_decimals_worksheet_grade_4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_16a83b6293b54c6687c5978db5251101.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_bc6352799fd3456aa9adcdd59996a4ad.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_f19eebc6acb747c2b769dabc46fb7d47.pdf?index=true
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_d9251c17e9a44934ad1c96c25c17450c.pdf?index=true
    • https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_1b6b7361bea24c2ba188d0feebb26312.pdf?index=true
    • http://mibavened.rf.gd/pulse_code_modulation_using_matlab.pdf
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_3151e60c4753470b879ffec620347fd2.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d5.bin
f500a41f18483a331e596de91a7453929218a35871a47e35f966af5f3c46e434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 4868 bytes
font_01_sfnt_off0001063a.bin
3d8dda1d7a958df794ba4e12f7e00452684cab87313c0234929dd8a428d5a6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 12492 bytes
font_02_sfnt_off00012e23.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 4324 bytes

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