Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b5239827fbab1f…

MALICIOUS

PDF

78.0 KB Created: 2021-03-07 01:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 536a8680a37734cc507d6b611c81c9dc SHA-1: aa660f36c6daca9812256b893a8920d9bd0400fd SHA-256: 66b5239827fbab1f022870b7f67e63e828f7226f2dde2997e6b9f44d35a00e94
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable domains, with one specific URL suggesting a lure for downloading an 'audio driver'. This indicates a phishing or scam attempt to trick users into downloading potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://gimoguvi.ru/strik?utm_term=download+audio+driver+for+windows+7+ultimate+64-bit PDF link annotation
    • http://pakawuwujawo.getenjoyment.net/overeaters_anonymous_eating_plan_grey_sheet.pdfIn PDF document text
    • http://krokoboko6.xyz/sat_subject_chemistry_bookivvun.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/how_do_i_program_my_liftmaster_garage_door_keypad_without_enter_button.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/how_to_crochet_a_baby_sweater_for_beginners_step_by_step.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/fisher_paykel_built_in_fridge_review.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/sevetunonabiwapakowudowak.pdfIn PDF document text
    • http://pesale.pro/what_is_the_meaning_of_the_flower_of_life1bacj.pdfIn PDF document text
    • http://avit0.pro/vagukwtykv.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/rootsmagic_7_registration_key.pdfIn PDF document text
    • http://freshmind.net/gufinilakurawosasasazomnqems.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/16715488439.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/columbia_contemporary_civilization_reddit.pdfIn PDF document text
    • http://udilische.club/war_dragons_soul_dance_discount46fls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekejuf.atwebpages.com/44587018097.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/28467097320.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/monopoly_rules_buying_houses_in_jail.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/episode_guide_succession_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/avast_antivirus_premier_2019.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/kashi_kannada_movie_audio_song.pdfIn PDF document text
    • http://xoxigibutu.epizy.com/67686616679.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5700 bytes
SHA-256: d954cd745c396f0a04d5d36ae6bdbe9fa10012ff86a6a5a0f9a3c37f768e5c91
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10140 bytes
SHA-256: b881d6675f4c672d1b5c2e8e74bd41dd33ee183d6378a5841fe5ef73bb7a7fd7

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