Malicious PDF — malware analysis report

Static analysis result for SHA-256 755ff878166ef771…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 16:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82b5662edd40a9bfa025f5b37240f2b1 SHA-1: 8938e39cfb0c0f0de2c00a782647174f919e9bc6 SHA-256: 755ff878166ef7710ffc677504eabb9546c2d6d84eb052612e2cd4923f556eb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=ben+10+up+to+speed+apk+mod PDF link annotation
    • https://excellencetogether.com/img/files/file/19898886853.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/medorisunitemekivuwakew.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630452125.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/32971693149.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/19272776695.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xujegezavobigububaro.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/60047389543.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/jejajuzexuw.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/577907368.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/dekogevowuxilizuzipagiva.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907142838601.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/90269532846.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519d11deb6---sanipegetaredogalasagik.pdfIn PDF document text
    • http://acelybio.com/upload/files/vovodubezugovesip.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/17578339815.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jumejizop.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/wenex.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/vigaxidu.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xoregenolafa.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/rinulafej.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/10211742358.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/26128349904.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/xodobakeg.pdfIn PDF document text
    • https://clinicscrm.com/img/files/33472578995.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_off0000c19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19B 17764 bytes
SHA-256: 8b48147f988d1751335fdf4a8953de3db46beddfd80cc7bdedb1b8f87c4d0ac5
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10736 bytes
SHA-256: 2e651a5a622f10fe465fdde72cd6d42c8851977f87c92d962c0ed71b7444fcc8
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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