Malicious PDF — malware analysis report

Static analysis result for SHA-256 542d4e39c7d4739a…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 79c66f1c8dd17905f31436e5978d603b SHA-1: 791c6dc0c2ce22ec8731334f5a2946e1fc55c205 SHA-256: 542d4e39c7d4739a28385de4b7f7b3b8071037aa09bf67c3923c3d8007d867ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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/123?utm_term=informacion+amigable+del+mef PDF link annotation
    • http://prizinsta365.site/310531111760vdbi.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/fHigoij/new_english_song_ringtone_download_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/rimudatige/hgI9jd3/sincronizar_contatos_icloud_para_android.pdfIn PDF document text
    • http://fortysgjdk.fun/xuvapermee0.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/816720.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/gdRjeha/soccer_spirits_wiki_dual_ace.pdfIn PDF document text
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/jabinogal.pdfIn PDF document text
    • https://cdn.sqhk.co/rawuredilu/3MjbWqw/semicolon_and_colon_quiz.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/tamute_tetuk.pdfIn PDF document text
    • http://gdztut.com/fashion_design_powerpoint_templates_freergrwl.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/iTjfahb/18867144838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/348aed4e-9a13-451b-9ae2-d25e3074afd5/how_to_grill_steak_on_cuisinart_griddler.pdfIn PDF document text
    • http://sabinozugi.epizy.com/period_tracker_lite_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/factoring_polynomials_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7c477f-55bd-4df4-8335-ce39ce811bee/nedutalotupukamadijeju.pdfIn PDF document text
    • http://nabukewegurizev.rf.gd/38767247849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba2ae3f-9b78-44d3-beea-366e9a0304df/50247472329.pdfIn PDF document text
    • http://bapaxofobawob.rf.gd/75055313625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52b3645-47f1-4522-920e-c03c3e6cc678/ruvilawowimelixanadixig.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/bisovugu.pdfIn PDF document text
    • http://zovewopot.epizy.com/doxibados.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/76302454349.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/addition_word_problems_grade_1_worksheets.pdfIn PDF document text
    • http://vuvevuzipag.rf.gd/prioritization_delegation_and_assignment.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/62916771650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c724f2-10b1-4371-916e-418f388ffa8c/lista_de_verbos_regulares_e_irregulares_en_ingls_para_imprimir.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 5240 bytes
SHA-256: 9959ba568f04c851e0cf08c33e12279f0c13453c59f9b7f2aa4f3d2b62f85b53
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_03_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 11140 bytes
SHA-256: a8f3f727d391481b3e0be0cf72301dceb9b55a92fd958be8a1bc521483737b5c