Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b06a9d8fce942b…

MALICIOUS

PDF

92.0 KB Created: 2021-03-16 19:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 558b35db71956d8f20739c42722d234a SHA-1: 24a316fdd32a7e1e302bda0b596ba825e3ae3a63 SHA-256: 72b06a9d8fce942b8c1ef5a7906315fb1fbfb00dea6bf58c56af1df5c9576c29
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one URL specifically containing 'paypal' in its domain name, suggesting a phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/award?keyword=thyroid+disease+in+pregnancy+acog+pdf PDF link annotation
    • http://sis-paypal.com/71925739981s6vx0.pdfIn PDF document text
    • http://copyright-infringement.business/how_to_clean_the_filter_on_a_samsung_front_load_washing_machinev9hck.pdfIn PDF document text
    • http://itprod.space/septiembre_2020_calendario_para_imprimircy8o8.pdfIn PDF document text
    • http://nesobaka7.xyz/why_isnt_my_ue_boom_chargingq5xz9.pdfIn PDF document text
    • http://rusakova.space/53177685469x67no.pdfIn PDF document text
    • http://luchdobro.site/what_does_deafen_do_in_discordl7k7g.pdfIn PDF document text
    • http://netlysy.online/36395475275eqqvb.pdfIn PDF document text
    • http://glawerry.online/rekanuzazemefopiruvuuyrf0.pdfIn PDF document text
    • http://vengriya.space/never_let_you_go_instrumentalid54x.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/iehgwp8/ivan_the_terrible_and_his_son_poster.pdfIn PDF document text
    • http://smm-target.ru/semagoxadeluvawad7d0jl.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/aohigjU/gun_strike_mod_apk_rexdl.pdfIn PDF document text
    • http://lavka-karamel.ru/371743900209spn5.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/aidiaig/texujutejuf.pdfIn PDF document text
    • http://allroadkamchatka.ru/how_much_is_an_african_wild_dog94fiu.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/ijhbwkb/enyo_pharma_crunchbase.pdfIn PDF document text
    • http://community-day.ru/baixar_os_axiomas_de_zuriquesylva.pdfIn PDF document text
    • http://vovality.club/descriptive_essay_examples_with_thesis_statementdocol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_713087781b824cf18267316a14a44f64.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_24d31f0a38dd41e2b67d789683c82dcd.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_e800d01f6cb14373831e64d78c3ed498.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae437ec-7894-4993-a369-beb000ffd9e5/what_does_the_number_609_mean_biblically.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_f707d7caa38f4ee28aba242d94d89f86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19eac32c-193b-4650-a566-768f68155b9f/us_army_recruiting_command_battalions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769ccab2-9e8c-49e3-b9eb-a287bd77fdde/ea_sports_ufc_3_pc_download_key.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 5436 bytes
SHA-256: a7b544d86e730afdfbc003c4676b43966ad519da391cf6e1d64454b0cdfd4296
font_01_sfnt_off00013da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 10832 bytes
SHA-256: 763426167c7bec0b4a97a3419c911ec84ba20a546fda2b8f968b08fca178392c