Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e4ebd63bbd070f…

MALICIOUS

PDF

72.2 KB Created: 2021-03-14 20:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 82ee45f0ff300db37ebdb13ceeeeab95 SHA-1: 9fc8ffffbcb297397bd76c8b8f0e7a82bcc7a491 SHA-256: 59e4ebd63bbd070f5f4ca5795c285fb8c85096f7929402a5fca047b0d9876022
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely used to host malicious content or phishing pages. The PDF structure and the presence of external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=descargar+capulinita+pdf PDF link annotation
    • http://ribadubeko.scienceontheweb.net/two_syllable_words_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_6047f48aa7821.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/pubilididixokakekasaw.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/basic_english_for_computing_teacher_s_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_601f94d2c9e59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419451/normal_5fe1192e40e59.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/68135933536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_603714a7c4b63.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/1306373102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5fecbf3e9c3cf.pdfIn PDF document text
    • http://lezozopose.iblogger.org/goted.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/vovopafubipu/physics_for_scientists_and_engineers_4th_edition_giancoli_ebook.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/xesatofetupikuz.pdfIn PDF document text
    • http://bufopalepigugu.epizy.com/xigevumopisuvabaponuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/anemia_guidelines_ckd.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/arc_hydro_tools_arcgis_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/39369776001.pdfIn PDF document text
    • http://sajajuladepume.rf.gd/how_to_adjust_old_tecumseh_carburetor.pdfIn PDF document text
    • http://mutexuwe.epizy.com/vomukewirowedirilo.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/203183929.pdfIn PDF document text
    • http://zawopomosegasax.rf.gd/dream_of_best_friend_pregnant.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/did_charlie_kill_himself_in_flowers_for_algernon.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/new_sepsis_guidelines_2020.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 5320 bytes
SHA-256: 64dd26c0f64779522b122be8f680e4085b4660f817d0c944d7a235bb30b82b3d
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 11824 bytes
SHA-256: 3e1c561e09950195353ac6a74bd8005bfbdd1ece790980c06612a34ac3b52792

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