Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae540ae21f611b6c…

MALICIOUS

PDF

100.3 KB Created: 2021-03-04 00:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8243db940255fc38a16978e6ab59f4e4 SHA-1: 2adf0bb562d9cd91bdbcc1b2601ba8cd36611f3b SHA-256: ae540ae21f611b6c82be69aa8dad30d551da20654c49027fe228ccfb6497136b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://jumiwimov.ru/123?utm_term=how+to+use+a+steamer+to+steam+vegetables
    • http://zarewubizeno.mywebcommunity.org/23875791606.pdf
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/bevosisis.pdf
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/f1c3f3bc714f2ca.pdf
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fcecc3056d27.pdf
    • http://xadimilok.iblogger.org/chaubandi_ma_patuki_full_song.pdf
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/8152574.pdf
    • http://bebolekuku.22web.org/conversor_para_word_candy.pdf
    • http://wopebexe.66ghz.com/how_animals_move_worksheet_grade_2.pdf
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5ff0879905b9a.pdf
    • https://rulurutepiket.weebly.com/uploads/1/3/4/8/134881251/1708363.pdf
    • https://zumofadun.weebly.com/uploads/1/3/4/0/134042547/pokolabatutavon-tupepujefenasi-kasajik-lenofufedod.pdf
    • http://pefiworawodud.mypressonline.com/singing_for_dummies_cd_mp3.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_601fb84118bfc.pdf
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5fe28426369ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pivutabomenatam.rf.gd/ford_explorer_replacement_parts.pdf
    • http://nifibomagogov.rf.gd/vocaloid_hatsune_miku_free.pdf
    • http://ligumawi.epizy.com/12457862324.pdf
    • http://navasegekukuj.epizy.com/akhiyon_se_goli_maare_movie_song_ming.pdf
    • http://fobupozomorefiw.epizy.com/paec_job_application_form_doc.pdf
    • http://gufusogatodogej.rf.gd/rijiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014db9.bin
137cf698834114dfa2df505ce9d294f86bc6c66d779787ed5a0352a446d4ee1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB9 5256 bytes
font_01_sfnt_off00015f9b.bin
0904314ae40a317df7194ae01e4bfc6dff580bcad848e7040bfb3125c5951f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9B 10600 bytes

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