Malicious PDF — malware analysis report

Static analysis result for SHA-256 0135797b76d96589…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 15:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2f660b60bed9d94c455b1d7fe83ae7da SHA-1: fa587c4b46c77361235000c90f8b84866e7cbf32 SHA-256: 0135797b76d9658919f1b2ad1ca1ef3a01546df542d43764cf687615d548c9fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The presence of these URLs and the overall structure indicate an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://brandiassociati.it/userfiles/file/powusezuni.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3d667dfd0528e83955e7d9379f4d7c97/61858230560.pdfIn PDF document text
    • http://marketingnews.fr/images/file/zewevi.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/91257845360.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/bogiko.pdfIn PDF document text
    • http://santeh.md/img/files/22253018560.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/97161229326.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/bowenedodu.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/weponasopibupazujiran.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/77134090174.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hudhta0ncb9ai3tt4ha17a6l8a/41973695122.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/tidakumemuku.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/magunoxe.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/laxenisowujomefof.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/49016416519.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34870585839.pdfIn PDF document text
    • http://jarosi.hu/files/file/73384383889.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/91441209272.pdfIn PDF document text
    • http://3sdent.com/upload/files/50119461394.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/65285445514.pdfIn PDF document text
    • https://questyme.com/userfiles/file/kojatedibabaf.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/xulenitorujoxubitadaj.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/90914746137.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_93EB0ED5378E9AA2.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jivaxukolazodimufevemor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bg+changer+apkPDF 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 19260 bytes
SHA-256: 1cf9dcfe48cec1b865556e9c1ea72938e5162cebc62bbf7582c12eac94782e98
font_01_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 10276 bytes
SHA-256: 3c82e07d3a540b7c0cbde8a0b3540203283d401be3fb3be5b5c1c3e8286a7e6d
font_02_sfnt_off00013819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1