Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1444a85ee31abb…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 01:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc9c4441b53139ed626b4bdb4c5a54e1 SHA-1: c0c56b1165181146598de6e9c23d7905e7368d68 SHA-256: cb1444a85ee31abbfde9db9ceb97682f34da5d6463ee36d831f5cad3d47a2d58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded links suggests an attempt to redirect the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=how+to+get+siri+in+android PDF link annotation
    • http://balbu.hu/uploads/news/file/mijutefukevigexiken.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/94459400334.pdfIn PDF document text
    • http://weingut-suppan.at/files/zajonokivupolixawuma.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/10314387513.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-30/20210930210011173297.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/sodawasasuduwusakupije.pdfIn PDF document text
    • http://thaide.org/userfiles/file/88352784851.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/damovaduzimazemenenejut.pdfIn PDF document text
    • http://soles2walk.com/data/file/44816911891.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/guxipujojaxuv.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/fibaduleluwusanidedam.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/womuwosikijokirelidi.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/98547265552.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/lezolumazanog.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/nipawuginilelomuli.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/seriroxebesetewabaw.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/50348771685.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vusimogizox.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/sazarupovolalujekum.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/97528180004.pdfIn PDF document text
    • http://rinsacars.com/files/others/62631903236.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/nimuxosimofisufowadi.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/gidab.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/devorita.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/41843295299.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://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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 10456 bytes
SHA-256: b9b3d26a2424d0f659d8c2ecd7f1669f1973de9aac969393d20b560373719a07
font_01_sfnt_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 18208 bytes
SHA-256: 09d2888486593ed34cab408cb8da0cea0b85f4518dbf6a763f16e78b262a6ec7

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