Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9ead532fabf4c9…

MALICIOUS

PDF

71.2 KB Created: 2021-04-07 01:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 452756b58c3b81c64f4df53b01d1644b SHA-1: 1b0a1686938adc8bd83c60d1f61b3791545142d0 SHA-256: 3a9ead532fabf4c9018507799704a88296109e864c38fe0b2aa44cc5de9f5eee
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating a large number of links on disposable hosting, likely used to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://spotlight-sites.com/sites/default/files/webform/loboje.pdf In PDF document text
    • https://www.afscme65.org/system/files/webform/52844377902.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdfIn PDF document text
    • https://aboss.by/sites/default/files/webform/10891008032.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/xixarujopotagateregigo.pdfIn PDF document text
    • https://www.uts.cw/sites/default/files/webform/pugixenarewowu.pdfIn PDF document text
    • https://www.jwico.com/sites/default/files/webform/monufugabezexi.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/79062027218.pdfIn PDF document text
    • https://www.telluridescience.org/sites/default/files/tstc-applications/fezijorimofilafomifum.pdfIn PDF document text
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=preschool+letter+tracing+worksheets+pdfPDF link annotation
    • https://minorsoncampus.princeton.edu/system/files/webform/wetesagepe.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/83328436210.pdfIn PDF document text
    • https://community.princeton.edu/system/files/webform/22535495660.pdfIn PDF document text
    • https://www.healthdata.org/sites/default/files/resumes/53082175038.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 5576 bytes
SHA-256: 2e006729a6b10570749e6cc11918726b90618b6050d22c4fcd4867753ea2fe61
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10792 bytes
SHA-256: 6b5f1759676c2695ab7e8972a95560722615d9172d7a41bb02f3a660b131d314

Open this report in the interactive analyzer, or submit your own file for analysis.