Malicious PDF — malware analysis report

Static analysis result for SHA-256 783758c037223df7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 02:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59505a67140cbacec72e2719a4c987d0 SHA-1: acecd5fc7893619e68b67705f2c74a10e1171bfa SHA-256: 783758c037223df7309cd026538292e22f29b3904fb1a24ac0632607f8bf95c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2194ef273---zokasimujagiwelida.pdf In PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/gopilejawesatojusipam.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/73608366704.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/namozawerijojagor.pdfIn PDF document text
    • http://talleresjpg.es/img/file/golon.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mafimasufu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/xepukupusufedakizoze.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/pekavujegululiw.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613812f6f0345---48131907424.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zodam.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/69662316793.pdfIn PDF document text
    • http://boldogelet.hu/media/93269371687.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/levorugirogumetuleno.pdfIn PDF document text
    • https://agatanorek.com/files/file/3891998035.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80756648669.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/29162751825.pdfIn PDF document text
    • http://swhos.com/upload/files/60854734588.pdfIn PDF document text
    • http://saaretravel.ee/images/file/72197997652.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/boxapuvakatibobosujixe.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/46102810566.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/zituj.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909210736506931.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/narejupefovavuzimideseli.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/xifaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=real+time+data+usage+monitor+androidPDF 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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 17804 bytes
SHA-256: cd0c54693bcd9b09eaf7dd963408515b03702f35c6b77dbba3d75e4e69e82832
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 10736 bytes
SHA-256: e87013d598324951d0d0bb94b684939e14ffafb58e96755c77d7d87fb1e7a1ff
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1