Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d7ce52636182af…

MALICIOUS

PDF

78.1 KB Created: 2021-06-06 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3e4bc1e1a8a45c12def5794dedae003d SHA-1: c3455d27d10f54ab09f6e0cd916ed1581d18c64e SHA-256: c8d7ce52636182af83032af6020a54328a65b21ae6b2c0a4796b8e5942d4e101
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm or a redirector to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to nail art, likely intended to disguise the malicious intent of driving traffic to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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.
  • 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://wastran.ru/pbw?utm_term=how+to+do+uv+gel+acrylic+nails PDF link annotation
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/5068339.pdfIn PDF document text
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/f29448ae310f4.pdfIn PDF document text
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/zufagavisumavoselila.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/vukujot.pdfIn PDF document text
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/9518621.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/supupetidixopo_wataxovezam_wifadog.pdfIn PDF document text
    • https://wububored.weebly.com/uploads/1/3/4/0/134042895/53042f855ad272.pdfIn PDF document text
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/fodafoxasomex_gebuwonagolo.pdfIn PDF document text
    • https://borupulugugel.weebly.com/uploads/1/3/4/6/134620486/5501877.pdfIn PDF document text
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/350fc0ea0.pdfIn PDF document text
    • https://segurabo.weebly.com/uploads/1/3/5/9/135964373/bojus.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/mobedumegukagiziz.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/65a08222737893.pdfIn PDF document text
    • https://seligelota.weebly.com/uploads/1/3/1/4/131453084/c99afcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogulazedub.pbworks.com/f/how_to_save_wifi_passwords.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/zerefofujowojudutidel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9177e737-f55f-4e13-abd8-a7d291aa7069/ketubefikuxurix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04796c20-0512-4671-a0d0-d00fcad94b95/how_to_mine_crypto_2021.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/bible_quiz_questions_app.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144483927/sparknotes_slaughterhouse_five_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59be7b8a-e0ab-4a46-89a0-1ce0401a9bd9/4th_grade_common_core_math_fractions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b47506e-ef52-4cbf-8e45-bedffa135a29/reron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f6d685-d484-4312-9ade-597e755d919c/download_game_gba_avatar_the_last_airbender_the_burning_earth.pdfIn PDF document text
    • http://feteselulo.pbworks.com/w/file/fetch/144735084/how_to_bypass_an_electric_gate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8a8411-c149-483d-9a90-6662d363a0f6/vipimesoxukezazewugob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e4f579-9c5d-45de-8ef7-4108c0392fa7/how_much_does_a_teacup_pomeranian_cost.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 5324 bytes
SHA-256: 8ea662a112122a68d7e06991fd4eb084c5513ed1654043a5871fbe72b61e17dd
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 10648 bytes
SHA-256: 1b26fd526bd140c1bbe1911e0a0fb3fec3f709505b3e00c6133bb410a8b6fbfd

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