Malicious PDF — malware analysis report

Static analysis result for SHA-256 710bc5e1023ee3a9…

MALICIOUS

PDF

79.4 KB Created: 2021-10-08 22:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5f4fc84f0bff0190e3c4252de15a03d SHA-1: 57a72d4abc7f8c39836f9a7c306d6f9f3c216b75 SHA-256: 710bc5e1023ee3a9ebec0bf9effbf813aa7149d1f15ca5bfb45387e34e775ef7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm designed to redirect users to various disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious or unwanted content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://weiken-rc.com/upload/files/83587654796.pdf In PDF document text
    • http://morakothotel.com/file_media/file_image/file/13836797589.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630527517.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/xivevefipokes.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/zanitarajoxosinuwile.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/dutowatuwexovuwotete.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155d2bfeff68---71371624319.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/bukiwokezetawitudonabom.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/10015106236.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/57005714811.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/48522845189.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/33405095596.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/rerepirovukanamig.pdfIn PDF document text
    • https://x-software.cz/data/file/vabezoxirexudijanaxeterid.pdfIn PDF document text
    • http://carbontuning.ru/file/ladurivofab.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/tuwelumen.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/xuwajavinenak.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/venezomom.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/palipamuris.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/66329771339.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/82990668458.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2446512b---3439944767.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/fizojuxigaridadew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+3+iso+download+pcPDF 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_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 10572 bytes
SHA-256: cff40d6b476244b88e3af679bac00b62f5cab43bcc60dd3bc4df9f284a9bd9ac
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 19352 bytes
SHA-256: fa67bf4a8487b7554d185b95aa9858ae59f7afe6053e6b111429f4267c1b22ff
font_02_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1