Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf22076a4366b07…

MALICIOUS

PDF

65.8 KB Created: 2021-04-13 10:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bf780f2e151b32dca2bc5299362bb1e SHA-1: 10a49e3d2442683b99c69924548b0bdb2f80d0cf SHA-256: edf22076a4366b072c3beab0fef95dfbea347b33a6440592c0752a10f2dd35e3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.a1touchsolution.nl/sites/default/files/51131620028.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/79062027218.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/pefusoxewirevujilo.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/17232120942.pdf
    • https://www.woonsocketri.org/system/temporary/webform/viwubamonutimujogigifowi.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/93477879009.pdf
    • https://www.blplegal.com/sites/default/files/webform/piselusani.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/45910982832.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/30199048500.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/bekam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rom+pokemon+x+para+citra+android
    • https://campusrec.princeton.edu/system/files/webform/wawojamifot.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/posilo.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d193.bin
96ce7800fdab58b0fc1c61d66e7ef07098e86b9334d44485f1df50b4617bd7db
pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 5148 bytes
font_01_sfnt_off0000e309.bin
b5776866d28a63aade1a82adec9c3c8a1f25f7d287b31270104da150d8591d61
pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10692 bytes