Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61b52b9b06afb6…

MALICIOUS

PDF

79.8 KB Created: 2021-03-15 19:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 01a2dd4efbabc454b878de043c0200ca SHA-1: 98c242a79109137f4daba88814cf2e73f50943ca SHA-256: ce61b52b9b06afb6ea13d271299534347d9c753b5a185a7bc9f81956c1f2f242
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=autodesk+inventor+stress+analysis+tutorial+pdf PDF link annotation
    • http://pejazadajenatew.getenjoyment.net/agatha_christie_the_chocolate_box.pdfIn PDF document text
    • https://rinajota.weebly.com/uploads/1/3/4/7/134714435/lufonunudesof_dujupuzovivu_baloxexowu.pdfIn PDF document text
    • http://lajenasuwo.iblogger.org/kotal_kahn_guide_mk11.pdfIn PDF document text
    • https://vedudogekikusiw.weebly.com/uploads/1/3/1/1/131164168/382d5836105bdb.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/jogamozopij_ronusapawebaso_duxezegonusufo_wipeme.pdfIn PDF document text
    • https://cdn.sqhk.co/tarolaser/jaicgeK/final_fantasy_record_keeper_original_soundtrack_vol._4.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/lid9Xih/xtreme_soaring_3d_ii_free_download_full_version.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/wapujikumiburi.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/hpPuhj3/saxupuxewavekiku.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/a08454.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/8d23b4385ec.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/budovewesekaz/avidemux_2._5_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/68374900898.pdfIn PDF document text
    • http://vufuxit.epizy.com/mugozutulopegadali.pdfIn PDF document text
    • http://lasuwutiganije.rf.gd/designsponge_city_guide_tucson.pdfIn PDF document text
    • http://fugazite.epizy.com/actuarial_science_uct.pdfIn PDF document text
    • http://mekamaxabojumoz.epizy.com/citroen_c3_aircross_owners_manual.pdfIn PDF document text
    • http://rufevobovejexe.rf.gd/91454769427.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/buffer_solution_numerical_problems.pdfIn PDF document text
    • http://suvejosojop.epizy.com/how_to_open_sentry_safe_without_battery.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_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 5252 bytes
SHA-256: f8475b47428894fb656648d3c58dba29f4a15a029863c716626f4ef18bae031e
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 11296 bytes
SHA-256: 13d1ec7a2542839d27fb289bb964d8433ea6719fe047f0ac580f9d4e7511d182

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