Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef71fdac1db3bd4…

MALICIOUS

PDF

87.6 KB Created: 2021-03-14 05:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df8ec59f645480b2dda6e8c55356d999 SHA-1: 39c1af93ea7a4cf45b7b62a5fcf59a6d643aa530 SHA-256: 9ef71fdac1db3bd4aab9c496450c7437973f04b3b6344dceb6a63080d359fbb8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs likely serve to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://seumenha.ru/award?keyword=pengertian+kebutuhan+dasar+manusia+pdf
    • http://rofuzixaveminup.iblogger.org/gosiwojisetojotibemulo.pdf
    • http://gabixumupa.22web.org/motor_bearing_types_and_applications.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nokezipaxizowox.epizy.com/jixaduvofux.pdf
    • https://s3.amazonaws.com/satulibaren/motesaziwefajesaxubotopan.pdf
    • http://turulukovulipa.epizy.com/texupegawarusimotukalose.pdf
    • http://ranesewigiz.epizy.com/2nd_grade_math_teks_unpacked.pdf
    • https://s3.amazonaws.com/sevoga/fenoburutajofevotikapigex.pdf
    • https://s3.amazonaws.com/mamibis/bigidudokogadovotato.pdf
    • https://s3.amazonaws.com/mosezavor/nuxibule.pdf
    • https://s3.amazonaws.com/minegikukovel/add_attendees_to_outlook_meeting_on_android.pdf
    • https://s3.amazonaws.com/xomudufe/59278781502.pdf
    • http://dagalukuxi.rf.gd/permanently_shut_down_nuclear_power_plant.pdf
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_78e74767931d42259ac7e89874b9b2b4.pdf?index=true
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_1f10ec6fd0f4412db6160d158773ab77.pdf?index=true
    • http://kixajek.epizy.com/pokawag.pdf
    • http://moberasar.rf.gd/susufitusimisaruk.pdf
    • http://jisosovogumi.rf.gd/filivipinubadivopigadupa.pdf
    • http://xenavak.rf.gd/tupexomawenaxagexodow.pdf
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_ed356ea6d020406c81a21f9e0edb2de9.pdf?index=true
    • https://s3.amazonaws.com/fejenijovekozu/english_grammar_tutorial_videos_free_download.pdf
    • http://wupuwijekoja.rf.gd/this_is_why_we_sing_song_lyrics_greg_gilpin.pdf
    • https://s3.amazonaws.com/wazotojemov/calcified_root_canal_management.pdf
    • https://s3.amazonaws.com/lovomijelun/nabidaruverujere.pdf
    • http://gikasabedadex.rf.gd/imagenes_de_las_parabolas_de_jesus_para_nios.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_off000119fc.bin
69649a01bd6b391cd7126e3390611981df8ae5119a165ede8fec2d55f849cd89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 5628 bytes
font_01_sfnt_off00012cf1.bin
a2cf7476a8ff3a71188360238044055a327973cb6df3b356e30d59d8378dde12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 10408 bytes

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