Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa1f4ac8c6271f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 04:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9770a264ade67b20651126c2aea6d3db SHA-1: 80e64a69f7dc709a345dd3c8d585c03e94c349c9 SHA-256: d5fa1f4ac8c6271fb3b3aca0ca382cb295fc1852e6077ca06de497be22d77f25
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://songhongresort.com/img/files/409207263.pdf In PDF document text
    • http://022-web.cn/uploadfile/file/20210921044456329.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/petusa.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/50479608286.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/lexoduwo.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/2694513530.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/suvutidemu.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/kigaw.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/81167443088.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bavewuzaguxifib.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5aea501dd---24793287905.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/26501614672.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kuvisurekapaz.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/godavumonova.pdfIn PDF document text
    • http://m2m2design.com/userfiles/kutilelolaxuvozon.pdfIn PDF document text
    • https://eguiders.com/uploads/694042669.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210902061528974.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/metobujig.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/38706778737.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/88144880792.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/18745516303.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xaposavapij.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/12446444778.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/pifijonipo.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/jinawaguzabi.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/68781134199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dj+truck+wala+gamePDF 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_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 16120 bytes
SHA-256: 5a1b4e5943d81d537b749bdde957e6b1db7266ec2d1cf66bf65a677200580e5b
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 10496 bytes
SHA-256: 83b3576fbc5b14bbee31eba7f89cf8d60a695e22c5efe26bb7ca13f56c1bed9c