Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae4fd31975fee07…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 13:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6331d08847ce53cf0c2bee8657e8adb3 SHA-1: 13c80565338b5aba08da62cd45b05a7d4719e0e0 SHA-256: 9ae4fd31975fee076d02a59d1f12acecb584bbe448c4846b88b25528ea66ec73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs pointing to disposable domains suggests a link farm designed to host and distribute malicious content. While no scripts were directly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=ielts+reading+questions+and+answers+pdf PDF link annotation
    • https://idd.no/ckfinder/userfiles/files/fumanajok.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/vusunapovisonaluwigu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/votebitaduwoxozelat.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/sogakopepumovowiboto.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/36374020304.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/32165816910.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/88728712611.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/suxubopixowakaxis.pdfIn PDF document text
    • http://ustunongel.com/image/files/jenorunepunoruwatadax.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/23904114296.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/surilesekawawenumatuze.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/56975615986.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/30989883765.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/95208432931.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5cdea8a319b0c685a856f3ff5f9b6d4f/tusunajazumadonit.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/4180309848.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kizaf.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/48069660244.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/53862541360.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/84966957364.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/gidakowagafilivejixexatum.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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 17640 bytes
SHA-256: 0ad96c96f6b4ea3a348e9c44d59ec1693227e1c9a706bd6f86de4e456c356d37
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 10956 bytes
SHA-256: 8ed80c43f52e3a3b5066464e769fd811ccb3490e138c1d65a6c26b31cbb69c00