Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de36b786e438e9f…

MALICIOUS

PDF

84.3 KB Created: 2021-02-05 20:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 35e7772c0f99ba318d1cdb4d5468afe1 SHA-1: 3c9651c33ec00edc456a2bef4b75b09920988d58 SHA-256: 3de36b786e438e9f701ef34c2c2d6185b4c2eb52cb6640b72d3b8646a61f4b8a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://leonvi.ru/123?utm_term=ley+aduanera+2016+pdf PDF link annotation
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/1486871.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/emvigkx/bein_sports_channel_number_spectrum.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/5138761.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/3974786.pdfIn PDF document text
    • https://judupivaruva.weebly.com/uploads/1/3/0/7/130775992/2c9c40a.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/ahjjgzk/best_free_random_video_chat_app_for_iphone.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/vukoz-zabediwi-jezoki.pdfIn PDF document text
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/tebinamam-wamapoxegefo-talakexomek-fotoli.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/ridor.pdfIn PDF document text
    • http://realnoe-obshenie.online/un_perai_sollum_pothe_mp3_free_downl2mkpw.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/dhf3ghH/battle_angel_anime_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/dASGQhd/smart_and_final_products_online.pdfIn PDF document text
    • http://profer-opt.ru/yuntum_marathi_movie_songs1pjgz.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/sumutilevorodepeweni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/60765571429.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/vmware_interview_questions_and_answers_for_l2.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/tudajisojolibizebobole.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/acrobat_reader_for_windows_vista_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/96960663773.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/56397231034.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_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 5348 bytes
SHA-256: 1ffb8dda03b1146c4f72984b4af3c4ac37f85c44448f60b2bf18ac9140a33928
font_01_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 11252 bytes
SHA-256: f4b90a8003004efb98c70d58a76cc78b4baabccda3052c5319919e45e1e9c4f0

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