Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbbc21a03a8dca4…

MALICIOUS

PDF

72.2 KB Created: 2021-04-19 19:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 843cf4ee4a066f69e6b66c7088ab8425 SHA-1: 21a8949b2e7de48a1b90309a2af0fda30d731b4f SHA-256: 7bbbc21a03a8dca4e55e538c5f21e4219c6745f72e0070a8928e7d13f457a11b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable domains and are structured as link farms, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.mothercare.ro/sites/default/files/webform/resumes/tawapiseligimagawawujimo.pdf In PDF document text
    • http://seiary.com/sites/default/files/webform/rec/pexutagizoniged.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/zavemazawutojene.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/3097059720.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/vomijalikuwukilowerosi.pdfIn PDF document text
    • https://www.dgs-interparts.be/sites/default/files/bipaxuvimul.pdfIn PDF document text
    • https://www.visitsavannah.com/sites/default/files/webform/nodarinit.pdfIn PDF document text
    • https://www.visitsavannah.com/sites/default/files/webform/90994069376.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/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dmx+512+controller+price+in+pakistanPDF link annotation
    • https://printandmail.princeton.edu/system/files/webform/85064040694.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/zuwamusijugowop.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/83605599331.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/26360011081.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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 5520 bytes
SHA-256: b6b25a5d340031ff3e200a65761a2b63f2a94632f463f916b1f851e0c5d15675
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 11080 bytes
SHA-256: f68a7215dd019f20315e048d9fa711050d17561fd73371ff6c3ee8a111499b17

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