Malicious PDF — malware analysis report

Static analysis result for SHA-256 414a0604d719731f…

MALICIOUS

PDF

105.3 KB Created: 2021-04-11 05:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dd531c4f5b466b07f21e88db94e711b SHA-1: 0c78bbb38c702845fa61007f50d1e486396adf45 SHA-256: 414a0604d719731f43d2cad3cdcbdeb25219c814f2bd92d5b35723101b2f82ab
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.muttypawsacademy.com/sites/default/files/webform/vaccines/taxevoxasubosiwugudabi.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/ziwisotug.pdf
    • https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/88462653206.pdf
    • http://spotlight-sites.com/sites/default/files/webform/wokasonexigugeb.pdf
    • https://natsihwa.org.au/sites/default/files/webform/degajakuko.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/basolidigululaba.pdf
    • https://aboss.by/sites/default/files/webform/12404161593.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=esquema+de+toulmin
    • https://www.vub.be/sites/vub/files/webform/lijulur.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/83703622856.pdf
    • https://gradfutures.princeton.edu/system/files/webform/49692556615.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167b3.bin
5989e19d81d8c8267074fcfd53c2b9eaf46990bc47a05807fa9bfdd9e08f97ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x167B3 4960 bytes
font_01_sfnt_off0001787c.bin
268fe453a4e521e1218086f22831c1d237ba56648b0d77ae0e9c42b1aa44827b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1787C 12192 bytes