Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa768ac4d9a5122…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 11:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f2e2f788e0da9ac2c4a3e0c5961fa2e6 SHA-1: f8b7083945183caf47a0f36a18da2680a2f7c9a7 SHA-256: 5fa768ac4d9a51228f55935f8e9fe6599b4715958ceb99b449db6a045523298e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic. The embedded URLs and the document's superficial content about an 'answer key' are designed to trick users into visiting these malicious sites, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/wix?keyword=magruder%2527s+american+government+test+answer+key PDF link annotation
    • http://vannabanyavsedela.xyz/alan_watts_meditation_musicqp4u9.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/DIghhdY/xbox_series_s_amazon_canada.pdfIn PDF document text
    • http://homearfes.com/sample_personal_training_business_planfvjsz.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/fejofasewu-guradagiworol-laxolesodovuf.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/ezGvic1/free_online_music_making_websites.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/IobjcvX/zetak.pdfIn PDF document text
    • http://kuxuvajivor.iblogger.org/kathi_mela_kathi_video_song_720p.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/nQjhd7i/jotukeleperogulawoga.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/posutazazelexetib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491164/normal_5ff796cf34a44.pdfIn PDF document text
    • http://specrazreshenie.com/android_borescope_endoscopebtvm9.pdfIn PDF document text
    • http://tcerkovniekupola.space/the_last_song_cast_miley_cyrus_playing_pianot0rlh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_603754e6d803e.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/bjcdyL0/microsoft_teams_background_settings_blank_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nakevoja/free_bootstrap_responsive_templates_dashboard.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/magic_chef_model_number_location.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/63169518327.pdfIn PDF document text
    • http://gajefeni.rf.gd/how_much_do_data_scientist_earn_in_nigeria.pdfIn PDF document text
    • http://zotinulimoruv.rf.gd/curse_of_the_azure_bonds_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/53454548665.pdfIn PDF document text
    • http://bakotege.rf.gd/maxadafilesebavazavawife.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 5464 bytes
SHA-256: 97a984c7c5659c66f30023c08af3850dfc2c4fe0aa5ae45c41f14f3a70d7a71d
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 10124 bytes
SHA-256: dd5455fd05d0adb73d22041937091e532b41341b6a3aa92f4a6198a29634bee8
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3