Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90ff7f79c81d21d…

MALICIOUS

PDF

79.8 KB Created: 2021-04-27 03:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bc0bb5f10f8ec366fe6b7da0f26e0e4 SHA-1: c475d802bfcf4220b5417b8c481f1685ffc1bcc1 SHA-256: f90ff7f79c81d21d376a5084559eec279fc867cd9364204ddccd5bca57fa682e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=way+of+the+four+elements+spells
    • http://kixurox.getenjoyment.net/laboritufewubivopi.pdf
    • http://dodajavux.scienceontheweb.net/youtube_top_dance_music_2020.pdf
    • http://peguxukeziku.sportsontheweb.net/cv_format_for_civil_engineer_experienced.pdf
    • http://pinenud.mygamesonline.org/60172031145.pdf
    • https://static.s123-cdn-static.com/uploads/4490722/normal_600388a8ca50b.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_600d46603417b.pdf
    • https://cdn-cms.f-static.net/uploads/4424026/normal_603a2c4e3351d.pdf
    • http://somubuzesixuwun.getenjoyment.net/canon_powershot_sx510_hs_manual.pdf
    • http://duxinivodozular.mywebcommunity.org/92805186310.pdf
    • http://ketrovk.xyz/synology_surveillance_station_8.2_license_keygen5pb0g.pdf
    • http://theharaka.online/39095094752p1mro.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fea0d85d3e04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_52a078cbdf0044e2901d9f9c2814a543.pdf?index=true
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_763ab0c0979d4411acb19aab19fe15b3.pdf?index=true
    • http://solarujarinobo.myartsonline.com/nlt_bible_app_for_android_apk.pdf
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_675616956610451ab69a5b5fe9eb0838.pdf?index=true
    • https://s3.amazonaws.com/nojemi/filmora_animated_emoji_pack.pdf
    • https://s3.amazonaws.com/voxulija/arroyo_landform_definition.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_c637c30cdca64acd91bf39e80c13befd.pdf?index=true
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/55724574391.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_off0000fb64.bin
cdef75f680ef13420a4975f863630060dae8e107018208a22c43a0e61788ce53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 5256 bytes
font_01_sfnt_off00010d34.bin
fe30e4964fedee5cceb61207bb8ccff63f2ed1f8e20af12d81598b508f282286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 10724 bytes

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