Malicious PDF — malware analysis report

Static analysis result for SHA-256 5183a1ce94a3fe6c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-02 21:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ad900876c46f3cee1311f65348044f SHA-1: b1b7e840c05cfb446aa0141959713742988e0358 SHA-256: 5183a1ce94a3fe6c859334a2ff23dc4bcc912c5996abae5a70dfea9356a926e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://midufefew.ru/award?keyword=disorder+of+digestive+system+pdf, which is likely used to serve a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=disorder+of+digestive+system+pdf
    • https://cdn.sqhk.co/vujenibolo/gfhcU7f/movie_maker_free_download_for_mac.pdf
    • http://vladport.ru/87295028630y7z3d.pdf
    • http://tepifugamokeg.medianewsonline.com/bespin_gambit_campaign_guide.pdf
    • http://kojijeku.mygamesonline.org/angielski_swka.pdf
    • https://cdn.sqhk.co/gabixeme/tcdUejf/dashlane_password_manager_family_plan.pdf
    • https://cdn.sqhk.co/fiporalisu/apgeaie/ice_hockey_near_me_uk.pdf
    • https://cdn.sqhk.co/tuxonewebuke/bhhakhf/block_craft_3d_easy_modern_house.pdf
    • http://likedizar.medianewsonline.com/nivizavinawifodurupura.pdf
    • http://copyright-notice-ig.com/how_to_answer_why_do_you_want_this_job_question_in_an_interview823jv.pdf
    • https://cdn.sqhk.co/zebimapajod/Dgejacl/49483115267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_a07d785586994bd7998b3f22d1a62603.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_8d2bf707c558495c829e00bc5241e70a.pdf?index=true
    • https://s3.amazonaws.com/bulolimepol/general_knowledge_questions_and_answers_indian_polity.pdf
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_e091a15f2ca440018aa3e452e5cefa36.pdf?index=true
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_a57442809ccf46eabcdd012f5ee894be.pdf?index=true
    • https://s3.amazonaws.com/povelenavuviw/blue_card_contact_information.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_391db56c63a24f9582660c9952ea5fef.pdf?index=true
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_4b5751960db14b79ae7356eefeeef4e2.pdf?index=true
    • http://xejobutek.onlinewebshop.net/barbershop_classic_tags.pdf
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_776a8c039f1f42a69393b89e25e34496.pdf?index=true
    • http://maxuluxusit.atwebpages.com/carnatic_music_book_in_telugu.pdf
    • 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_off0000fbd3.bin
fd79f4241ea913ce006172788a6b713ea54a7e6d00e4103973253406de3db603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 5280 bytes
font_01_sfnt_off00010dcc.bin
421a8172ee495fcfefd34ac731310dad50f5dec0035070c7c2bd220fb9dafce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 11016 bytes

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