Malicious PDF — malware analysis report

Static analysis result for SHA-256 8469f993a2f1c687…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 05:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d9b30e70dcb5342fee9c08b2636f03 SHA-1: 73a16c49a6eb33c3fa78699f486490ee9e821e8c SHA-256: 8469f993a2f1c687c5719c0b086a4491c5c27a468fe96849ceab9106b333bc15
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a PDF link farm, indicating it hosts numerous external links. Several of these links point to suspicious domains, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/123?utm_term=ibpsguide+daily+quiz
    • http://characduwe.space/10625259209doyxp.pdf
    • http://shoop-fo.ru/alter_ego_a2_s_exercer_answershfiki.pdf
    • http://daating19.site/sebobowonososunadatisezuxqloh.pdf
    • http://help-bluebadgecenter.com/amazon_books_john_grisham_a_time_for_mercyeoozq.pdf
    • http://crysety.xyz/7534388079388zlp.pdf
    • https://cdn-cms.f-static.net/uploads/4471703/normal_6029c6cb00ee2.pdf
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5ffe2af626f8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gogoxowiniza/barrister_songs_free.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_ddb70276927d4fb39e7b3d20feefffa8.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_a96aa05b0b194c588a6a69a9f0c037af.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/71181425635.pdf
    • https://uploads.strikinglycdn.com/files/ac2bbc46-0496-455c-a8be-39d462ba2bf3/el_seor_de_las_moscas_pelicula_1963_descargar.pdf
    • https://uploads.strikinglycdn.com/files/9da82a37-eb0c-4e44-9732-ea802ba3173a/blackdecker_20v_max_string_trimmer_edger_lste523.pdf
    • https://s3.amazonaws.com/sejakopa/6th_grade_math_multiple_choice_questions.pdf
    • https://s3.amazonaws.com/safago/81049614505.pdf
    • https://uploads.strikinglycdn.com/files/57f4af46-f2e6-4d5c-9406-6666886120a2/47128216449.pdf
    • https://uploads.strikinglycdn.com/files/dcdad394-8476-4bfc-b7e0-e2bf34aa6d65/43447398617.pdf
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_502ba5250b43464ea3173c2943e14a8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f9e9407-5b0a-4423-936f-281040e786ab/roman_breviary_in_english.pdf
    • https://s3.amazonaws.com/dibedamoka/historia_del_materialismo_lange.pdf
    • https://s3.amazonaws.com/muwemivumazulax/65505357327.pdf
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_2053e779f28f4805956c7d992f11179f.pdf?index=true
    • https://s3.amazonaws.com/jemazejodep/chinese_language_file.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_4fb06c6302bc46088138f18674733522.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/mujutubutamexim.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_off0000eb6e.bin
83b7a33c2ab3340840ea10187a64645252e0d60ea328b97850187455bfc144f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 5388 bytes
font_01_sfnt_off0000fdd7.bin
f8c347c26f6b1fabff685d0adc4fc26ca10d55318043d4a42742b589ae0953b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 11580 bytes

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