Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7db43fd9a341d4f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 02:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76972b40a48fdc444bb950b8c021b916 SHA-1: 69ea00981080ad2f468356d0a2afc43d89df826c SHA-256: c7db43fd9a341d4f892a3606575d863ea2107aea78a563517a16d2a4bdcf9c09
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yonseri.org/userfiles/files/vumedilumivamofuwo.pdf In PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/21698493212.pdfIn PDF document text
    • http://apicn.net/upload/files/moxeligeketajumukasun.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/tezakezuwiz.pdfIn PDF document text
    • http://uhorder.com/upload/files/vemekufosegubu.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/fijiwerabiku.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/5100840950.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/76755411035.pdfIn PDF document text
    • http://status.cz/UserFiles/File/87508517861.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/23462884016.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/92943775721.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/29624176135.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/pedazikodegarufuxe.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/67030056783.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/3801041226.pdfIn PDF document text
    • http://soles2walk.com/data/file/59533395269.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/baxatimitig.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/15233552012.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dafinolawatigamebexa.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xuponobedutuzupuzokepojib.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/77211423879.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/wapupiwuve.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/najakuvodi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6fe2310a6b6e61309ab0444106c5a9e6/pibemesebewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pubg+mobile+video+download+mp4+pagalworldPDF 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_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 10940 bytes
SHA-256: 0597f86a6cb007b8392be27999fc73b2cbc5e8d84bee5c4db622e0e133cdfab1
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 17424 bytes
SHA-256: 4c8849011d813345ac2edfe84d9173369ae70cec065a633fc48ab24ccd565df7
font_02_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1