Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f7a65faef947b7…

MALICIOUS

PDF

83.2 KB Created: 2021-04-14 10:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49619b6c45eb9938a5638fc937d4653 SHA-1: 3a80d2546a56e5d8f8df18b18753b3e4f378e844 SHA-256: c2f7a65faef947b7574e684fc372738e2a6d035f30eb7181a5f31ed023ea2c74
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and external links are indicative of a spearphishing attachment, likely leading to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=connect+yeti+mic+to+iphone+11
    • http://jekefidaz.mygamesonline.org/barron_s_6_gre_practice_tests_download.pdf
    • http://roserubusigiwij.mywebcommunity.org/best_free_reader_for_windows_10_64_bit.pdf
    • https://cdn.sqhk.co/wofunukasu/igsig9y/tuning_club_online_mod_apk_rexdl.pdf
    • http://wazasutosas.iblogger.org/ai_hoodie_design_template.pdf
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/9443834.pdf
    • https://cdn.sqhk.co/gesimefav/Aif5pii/what_is_game_launcher_app_on_android_phone.pdf
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/c060e.pdf
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/kederabiwiloveweres.pdf
    • https://cdn.sqhk.co/jutafegobexe/WLzDdu1/download_game_drift_zone_2_mod_apk.pdf
    • http://zagozogenef.sportsontheweb.net/netflix_how_to_train_your_dragon_2_full_movie.pdf
    • https://cdn.sqhk.co/nebemina/jF0gFii/xotedizovaze.pdf
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/7258555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitajosasa/udemy_interior_design_free_course.pdf
    • http://vimixof.onlinewebshop.net/33493209856.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_031ceecd4d674520b49e663c4ca215b4.pdf?index=true
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_a23f2909a9e545d5a8be6c1ef2f787d8.pdf?index=true
    • http://jifixarifiseja.rf.gd/zudopovexefotuledew.pdf
    • https://s3.amazonaws.com/xezonijida/rational_choice_theory_in_criminology_definition.pdf
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_664625fcd1b640698aef9af6461d34f5.pdf?index=true
    • https://s3.amazonaws.com/nazekisigiduz/bissell_powerforce_helix_turbo_rewind_pet_bagless_vacuum_walmart.pdf
    • http://selamamoli.epizy.com/top_games_for_pc_2018.pdf
    • http://menawikilu.rf.gd/frigidaire_stacked_washer_dryer_wont_drain.pdf
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_2a22b89de06b476b94a7bb7c47a521e0.pdf?index=true
    • 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_off000108fe.bin
579cbfd97a59adffe10bde3a09f868ddbe3e79a2e47a5c4b7b6f5701df01641d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 4716 bytes
font_01_sfnt_off000118f2.bin
7268f5dfa60408be83946b9fab16e4248f5efc8ed603f4248fd9a429f670eb00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 11076 bytes

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