Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f610238889931c6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98f7c16415f446970618a0f71caafb0e SHA-1: 7a006fe745b84727ef0f9b2300d36b91bee67bef SHA-256: 3f610238889931c69287500671dc141031999ef65cc1c22a1b3bec1382fc6bf9
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a link farm designed to redirect users to malicious content, likely phishing or malware. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://musiclivemarsala.com/userfiles/files/97188041012.pdf In PDF document text
    • https://qualitygums.com/userfiles/file/79260736711.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/vedunuj.pdfIn PDF document text
    • http://robedecreateur.com/img/files/23053745641.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jedewisumuwuvukonogejar.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/bopata.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/795980970.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vituvazadefowujugarebowuw.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/20792906560.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/69315645183.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/gomuliwatis.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rudnmrb09tgphihj59e76n0sh4/nizefupuribelu.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/83362777473.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/101f189e08c52bf434b656e00cfb1ddc/55821965120.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/3993380603.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/madusukefok.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/39139256378.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/vifenoditaminupitiw.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/ruvipipar.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/nixutugar.pdfIn PDF document text
    • http://surtek.biz/image/files/20150322_202123.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wowoxevazipavufiri.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/rebepekotiderog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+puffin+biruPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 10420 bytes
SHA-256: 49df40f7d7717544ebd5b68026c1f0143e7f149949da5c6839d1038a4fdd0f9a
font_02_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 16500 bytes
SHA-256: a07e512f3ced99dc092f8cd16ce08d823edb9fbc303264e18aba28265f5c6df3

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