Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae854a2e421ae5ee…

MALICIOUS

PDF

137.3 KB Created: 2021-04-01 07:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4b7535be0ac2af107fc16656b8ba0fc SHA-1: d609b6501561570fbaadd775a01b368c60f5ae25 SHA-256: ae854a2e421ae5ee7149fd1b73ca606348a590d01a696c28158644cadbe8e521
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'xezojetit.ru' and a heuristic firing for a 'Visual download / call-to-action button lure' suggest the document is designed to trick users into downloading a payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'blackboard app for mac', potentially part of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/123?utm_term=blackboard+app+for+mac
    • https://cdn-cms.f-static.net/uploads/4369496/normal_60562c2d7cd9b.pdf
    • http://jeruxawi.iblogger.org/44129322774.pdf
    • https://cdn.sqhk.co/nikitabejup/OzifgeQ/free_swim_lane_diagram_template_powerpoint.pdf
    • http://rujewazaxijaza.sportsontheweb.net/falisudejeresorijujad.pdf
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ffc09fb4565b.pdf
    • https://cdn.sqhk.co/sotatixorawi/EjdB7gj/robusebogemozen.pdf
    • http://saxobupazes.sportsontheweb.net/rational_recovery_is_different_from_aa_in_that.pdf
    • https://cdn-cms.f-static.net/uploads/4417024/normal_602526775f558.pdf
    • https://cdn.sqhk.co/zoxojuvef/hhIvjjc/get_100_likes_on_tiktok_free.pdf
    • https://cdn-cms.f-static.net/uploads/4384652/normal_600cf37e01795.pdf
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fecbb757fd44.pdf
    • https://cdn.sqhk.co/wogokodu/dlaupvW/screencast-_o-_matic_screen_recorder_free_download.pdf
    • http://werewov.22web.org/examples_of_asymmetric_information_in_economics.pdf
    • https://cdn-cms.f-static.net/uploads/4488349/normal_5fd1d3a8cc673.pdf
    • http://lemakomude.sportsontheweb.net/tratamiento_para_anemia_ferropenica.pdf
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5febcc6b8f40b.pdf
    • https://cdn-cms.f-static.net/uploads/4472776/normal_604ec0c5226fc.pdf
    • http://vitofemegawe.getenjoyment.net/what_does_chronological_text_mean.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pesetunal.onlinewebshop.net/musot.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_52829b7f8aa0495cbfef54f326417254.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_ba37f336b6dc4202a4b9deb82a326756.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8dea9e0016174276913b08dbb28fbc0d.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_0a06d54c13c24d24879b8d83842b97ae.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin
3da057945f0fd96395965d5846addae9cdee3e3105e16ca11f63ae9ee888ee7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 72412 bytes
font_01_sfnt_off0001c98f.bin
ca21a6de2b98a77f21d20faa8f79725f19216e9e48964566fb63053ee8dbf910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C98F 5376 bytes
font_02_sfnt_off0001dbc1.bin
c2ed3ea97e7b4d371e0aa25b827caf318ef581531962094b65166e7eeb9de6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBC1 10984 bytes
font_03_sfnt_off00020153.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20153 16204 bytes

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