Malicious PDF — malware analysis report

Static analysis result for SHA-256 c155d0fe37d1536f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-06 15:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ddd29e8f1787a89a5fd31980ab96539 SHA-1: 5d8b17696c5a6b501808d5a1753c5103147d64f2 SHA-256: c155d0fe37d1536ffcf08e461b1835b057e594f3eb0358db8e47677c5ef55d9a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of links. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=cronologia+historia+da+arte+no+brasil, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=cronologia+historia+da+arte+no+brasil PDF link annotation
    • http://pixidilivutep.medianewsonline.com/how_to_charge_trolling_motor_battery_with_solar_panel.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/Huhjjht/47857440756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fee0df314243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6022232da9282.pdfIn PDF document text
    • http://hookup671.site/premiere_pro_overlay_effects_free_downloadsb3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/hg3FjdK/rdr2_side_quests_worth_doing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_603f5ba72ab28.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/jcPTyjg/17623332781.pdfIn PDF document text
    • http://coloradocustomelectric.com/ford_mustang_ecoboost_enginetsu6c.pdfIn PDF document text
    • http://bitjoms.xyz/miss_peregrine_pelicula_completa_en_espaolgqzca.pdfIn PDF document text
    • http://carbags.site/9446173319941gyr.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/lehaAgd/color_therapy_an_anti-_stress_coloring_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowobovu.myartsonline.com/best_kitchen_stand_mixer_2020.pdfIn PDF document text
    • http://zosuvupetod.epizy.com/44328931236.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/how_many_calories_in_premier_protein_shake.pdfIn PDF document text
    • http://musolag.rf.gd/raveseforagij.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/magic_bullet_mb1001_replacement_blade.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/alabama_boaters_exam_answers.pdfIn PDF document text
    • http://wafugid.epizy.com/93550970801.pdfIn PDF document text
    • http://gariravufur.epizy.com/5591193389.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/batman_song_jaden_smith.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/gantz_perfect_answer_free.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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 5132 bytes
SHA-256: 34399bf4517d28d496b90e26f4ca8be0f528e16cad623723ac300aacdfe8c354
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10240 bytes
SHA-256: 3e22d29ca93b476dcfb6ee4fd694e6ff1534efcd4766df397e78695ab7603e8e

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