Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e966b7560fd582…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 00:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4db0c9cc296fc99a6a6f9586e3808f3d SHA-1: a193795c9b6f435cd49ae4942844859b24b6e3cd SHA-256: b5e966b7560fd582fd41027b60c033b0aba7c2efc0557842814e20f6047913f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's part of a link farm designed to obscure the true destination. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery. No scripts were extracted, but the overall pattern points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://aodaiminhhanh.com/app/webroot/uploads/files/zexojagakekafijabadumuri.pdf In PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/15068018913.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/44291172919.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/2841035077.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/79593513304.pdfIn PDF document text
    • https://ibericadearmerias.com/file/wefebimumali.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/xivawazisuvuk.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/21709454557.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/27987060691.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vatomumo.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/53978343085.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/98840166241.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/wujunuzimedazo.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/tazilagipevodojejubuziku.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/xemolidatemuguworojidoliv.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75558211514.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/20740548301.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fowazilizaxonem.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/62528822550.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/45295855281.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/39751259938.pdfIn PDF document text
    • https://subded.org/userfiles/file/buzonifurapavimin.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kukajuravufawogutawofav.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/buwukevuzabejinew.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/66080032760.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0ee72fa0---rulekaruxakotutotesigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+last+day+rules+apkPDF 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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 16428 bytes
SHA-256: 32c82d78dd2177faac34e39db8b1c5b87a4eec05cad211824f184a4e98a2d417
font_02_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10684 bytes
SHA-256: 9f3542cdb323d0886976cc1d0eaca714eefe62134ecc3efbd78729df33e64178