Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf783e74e4173b9…

MALICIOUS

PDF

62.4 KB Created: 2021-04-12 04:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f5dd7ae09a4c901c1f405d2c4e858f34 SHA-1: 1d1b6968eaff82924ac5f3cf4a77b7640a2e936e SHA-256: 0bf783e74e4173b99079248de5e18960a585420f6c6f85296ab0f0e70874afad
124 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body contains obfuscated text that appears to be a lure, and multiple embedded URLs were found, some of which are hosted on disposable domains. The presence of these elements suggests the document is designed to trick users into visiting malicious sites, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8289

Heuristics 4

  • 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
  • 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.ofalloncasting.com/sites/default/files/webform/nunemoxajusadokuxilebe.pdf In PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/72246142748.pdfIn PDF document text
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/38059385999.pdfIn PDF document text
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/bekam.pdfIn PDF document text
    • https://web.liderpapel.com/sites/default/files/webform/53484808665.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/nibobuzokojovafizuza.pdfIn PDF document text
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/12938533755.pdfIn PDF document text
    • https://www.mainephilanthropy.org/sites/default/files/79141676299.pdfIn PDF document text
    • https://architecturaldesigninc.com/sites/default/files/72694480293.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/15194676649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+avengers+endgame+full+movie%2522+onMouseOver%253D--%253E%2522%253E%2527%253E%2527%2522%253Cvvv000010v019771%253EPDF link annotation
    • https://printandmail.princeton.edu/system/files/webform/mizol.pdfIn PDF document text
    • https://gradfutures.princeton.edu/system/files/webform/86626084736.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/56905881998.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/85064040694.pdfIn 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_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 5808 bytes
SHA-256: a400dcc1e87cb9b3b7681cfec31a344f175978f362dc05776c1fa8bbedf416bd
font_01_sfnt_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 10024 bytes
SHA-256: 55dd831bd1a882af54e78933851f1771f24c3ffa616f7354dd9964a49087c2d2