Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a45aaa179fd5a38…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 01:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ba57be62c124786546ff373de3ef692 SHA-1: 59703e470766a157c5a2a8794e1c45979ccdc696 SHA-256: 9a45aaa179fd5a388b36fe1dc87453f3996ed56a93e7439d581d8b9ba39097d0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=sup+mod+apk PDF link annotation
    • http://gruppocinofilomarsalese.com/userfiles/files/57756233994.pdfIn PDF document text
    • https://hinaweb.com/upload/file/13980976958.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/52571404530.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/nifisitodedosobomarega.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/47897860001.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/birejukedotutizowufo.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/lujere.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/23166960545.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51718353904.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/52607362021.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/80427322088.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/wibipekafote.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210920092109.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76351765136.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/xesewoxexonogobudakiwefej.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/66148723353.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/31906862371.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/74142649388.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66782595100.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6f8903e---13073653106.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109161457095295.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210904162930.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/gufugomajofenaxovaz.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/lowejeturagalije.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 17376 bytes
SHA-256: 765e979bb103675662b85df47e2784148218b07655ba9399f2d66a730f63bf0b
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 10080 bytes
SHA-256: a42a812f6460e103927fe28c37296dd30637a17384089d596023bf4cc860a184
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.