Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7b0882a50f86b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 15:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b0de1c7ae7315ec47eb2f0deaa07358 SHA-1: 19a4b648b599ca6ca13e6d5e6337729ac3051b35 SHA-256: c4d7b0882a50f86b9381959ba05b7eba328d82ea38b9fde6534594cc6751a02f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malicious redirection attempt. The presence of external URIs and the overall structure indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=fifa+11+apk+android PDF link annotation
    • http://fw-simple.com/uploads/files/5417086684.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/mixozowapo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nubidu.pdfIn PDF document text
    • https://adikkedua.com/contents/files/41457998664.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/81799085671.pdfIn PDF document text
    • http://carbontuning.ru/file/65463004989.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kuwuli.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150820061833.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/jovubevipej.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/79032643848.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/28497529422.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/dilelejitipujilugoju.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/faxeratefadokimetora.pdfIn PDF document text
    • http://perksys.com/userfiles/file/47254248110.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/xufunaturalodi.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/6495955637.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/majakawesonefadebij.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/zujixajog.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/dafafarewekojijegogavi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/gixutimilo.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/68299721453.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/21715719118.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sejuvulanewubifojorumosi.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/kutanamapimef.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/4903347568.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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10168 bytes
SHA-256: 150f520dd41556e72580f69ee7ea117de1c1724abf2fae43349c1fb7e9c8fb90
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 18876 bytes
SHA-256: 23c03d3666e6615b45f3aeded44be02a91f237cea270c5087bccb886c56bd82b
font_02_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1