Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a112c9a1d67c69…

MALICIOUS

PDF

71.9 KB Created: 2021-03-20 23:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ee16709fd4ff808833c46c51bbb4d86 SHA-1: d767ce46d41b36f44aa3b12d2fe559857f36464b SHA-256: e7a112c9a1d67c699681ebe4ba660d0926970d7d1373595fd9e4b327143fa97d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+describe+a+tequila+sunrise+on+guitar
    • https://cdn.sqhk.co/fidumugovoz/giodvif/las_vegas_hotel_reviews.pdf
    • http://pojibuvuj.mygamesonline.org/muslim_baby_names_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4483851/normal_6045fde75ba1d.pdf
    • http://muzusebab.22web.org/39041229857.pdf
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fd1cd40917f9.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fd2e53e10e6e.pdf
    • https://cdn.sqhk.co/muxigatatini/ihc2sia/3d_tennis_mod_apk_download.pdf
    • https://cdn.sqhk.co/liwifetil/a0iiioN/zexojinum.pdf
    • https://cdn.sqhk.co/rogudokives/hgjfYBL/maharashtra_state_board_10th_class_books_download.pdf
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fdb7e34bac37.pdf
    • http://wefilevazobakeb.mypressonline.com/denotation_et_connotation.pdf
    • https://cdn-cms.f-static.net/uploads/4444877/normal_6014200eb7384.pdf
    • https://cdn.sqhk.co/sukurorezib/XQgdgg4/cartoon_mobile_screen_wallpaper.pdf
    • http://birobupalojasux.iblogger.org/asrock_h310m-_hdv_m._2_manual.pdf
    • http://posadukik.getenjoyment.net/zoom_h2n_anleitung_deutsch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kijekamazeju.epizy.com/business_professional_attire_vs_business_formal.pdf
    • https://s3.amazonaws.com/lakujusitejojet/jawozuvanikafijolezi.pdf
    • http://joboberunora.rf.gd/cuales_son_sus_caracteristicas_de_un_algoritmo.pdf
    • https://s3.amazonaws.com/gidibesuxi/22824726881.pdf
    • http://pitigapevede.onlinewebshop.net/ielts_writing_answer_sheet_download.pdf
    • http://gegenig.epizy.com/metformin_weight_loss_antipsychotic_induced_weight_gain.pdf
    • http://wijudog.epizy.com/45449028803.pdf
    • http://wetowotupime.rf.gd/lovixunazikuzojatinugege.pdf
    • http://jajojukadas.epizy.com/dodadiwu.pdf
    • https://s3.amazonaws.com/dojivewobasuval/pugesaberubusapaguke.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_off0000d6c5.bin
83abdcf63bbd94b82dcaa1e6f2c8f1357ed80714b146cfd169e65a3b5d9604f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 5428 bytes
font_01_sfnt_off0000e948.bin
a44d3e25792bb609da2c28166fe9c0c8be89b5ab8a5e53a4c3262c77ba796181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 12372 bytes

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