Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c2dd33c541a48…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 00:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511bdc68328dd040bd362f7000b64250 SHA-1: 752edafa1052a439454cf08c3c17228777753923 SHA-256: 2b6c2dd33c541a48f540c8f9a67ca56e5810f5673609f6f9db066162c2134bfa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards a link farm or phishing attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=5th+grade+math+practice+worksheets+pdf
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/zafutusigizole_mudabozavumuri_xogoregavomo_gojad.pdf
    • https://cdn.sqhk.co/kesusevuzep/hjibiia/sumolu.pdf
    • https://cdn.sqhk.co/gefimiwotux/oEgiamB/music_video_editor_free_video_maker_video.pdf
    • https://cdn.sqhk.co/zizenozi/hajb1jf/54300046693.pdf
    • https://cdn.sqhk.co/pubodegosog/qija28r/fit_tycoon_business_clicker_mod_apk.pdf
    • https://cdn.sqhk.co/dubagojovo/hhi4jtW/battery_operated_christmas_lights_with_timer_instructions.pdf
    • http://gasurorir.sportsontheweb.net/bowflex_treadclimber_tc10_used_for_sale.pdf
    • http://tejowigasinafu.getenjoyment.net/26012776291.pdf
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/dedcfe6b.pdf
    • https://cdn.sqhk.co/xusawikorut/lVhfc2F/98747663525.pdf
    • https://cdn.sqhk.co/wixexozesila/fOgeiiK/lewuguni.pdf
    • https://cdn.sqhk.co/litopozuf/k2hcIZp/vofomafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mawezuruselabej.epizy.com/what_word_in_english_can_be_a_noun_verb_adjective_adverb_or_preposition.pdf
    • https://s3.amazonaws.com/feliso/wapking_live_new_song.pdf
    • https://s3.amazonaws.com/sasufufa/pojupedosavezesareze.pdf
    • https://s3.amazonaws.com/kavalukato/postgraduate_scholarship_interview_questions_and_answers.pdf
    • http://mupufekugix.epizy.com/why_is_margin_of_safety_book_so_expensive.pdf
    • http://magapupegijovot.epizy.com/konoxukew.pdf
    • http://bogalibamadom.myartsonline.com/vapositokekix.pdf
    • https://s3.amazonaws.com/nelizenejakarug/fajosavafiwofoma.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_off0000eb9c.bin
3a1dcb46fadcd538e94569a466174f83174b52bdd03f152584758e3f3adf114e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5724 bytes
font_01_sfnt_off0000ff03.bin
3a2270b78f50f1e42f2659da3d81b15f3547c7aaf1e863133d42d5e81a56b861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 11156 bytes

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