Malicious PDF — malware analysis report

Static analysis result for SHA-256 8472cb592806459c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-16 17:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a2acb403dd5012702375db07b458b18 SHA-1: e7ad9f9d85af87d8049d9607810998c6adc73e5b SHA-256: 8472cb592806459c3fef55daec3e09296e512f1cf869e283a0ef3ae581e82cdb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a lure to download further malicious content or redirect to phishing sites.

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 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://golowaki.ru/award?keyword=ukulele+chord+melody+book+pdf PDF link annotation
    • http://fixmarker.fun/cabrestante_manual_mexico8jdxn.pdfIn PDF document text
    • http://straponartist.com/magumutuzokuwaxomedenifioxcfj.pdfIn PDF document text
    • http://romeita.fun/vuretl7d78.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/why_is_the_short_run_aggregate_demand_curve_is_upward_sloping.pdfIn PDF document text
    • http://lastmarkt.ru/zikegasamominuptopn.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/fabedukufiredenuvulub.pdfIn PDF document text
    • http://italywom.space/improving_vocabulary_skills_answer_key_chapter_4f0eno.pdfIn PDF document text
    • http://bomisedoxu.mywebcommunity.org/how_to_write_a_fiction_novel.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/salatul_tasbeeh_ki_namaz_padhne_ka_tarika_batayeylitk.pdfIn PDF document text
    • http://weareanonymous.org/zonadipusiwurugiwasodawaf67sv4.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/zabevog/mythical_creatures_word_search_pro_answers.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_66e2710d396b4bb1ab7653f6c0a5679f.pdf?index=trueIn PDF document text
    • http://lutepotazor.onlinewebshop.net/latin_quotes_about_life_and_love.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/resuti.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_0183e9a1e4b04033b2cc3d6d0e2d8b2e.pdf?index=trueIn PDF document text
    • http://vipuzala.myartsonline.com/52676237295.pdfIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_ae5dc32110954f7a8214156350658520.pdf?index=trueIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/pinetoxesinodijibedowofi.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_86acdc651a5747ffb2f89758aa61cc4f.pdf?index=trueIn PDF document text
    • http://wutejaxevewef.myartsonline.com/the_complete_idiots_guide_to_music_theory_by_michael_miller.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/lebadabugubeworilo.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5304 bytes
SHA-256: f0f633615162dcef6c66a0f7b8067f5a654aacc5a6832f4131ab817d8fd4b283
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 11484 bytes
SHA-256: 5f5e980ce2b6fb673d1c268a8f2aaa56af5275d713cdfbbcdd6799bbbf0c660f

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