Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81df0d4c76e3df4…

MALICIOUS

PDF

69.2 KB Created: 2021-04-25 10:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df7faeabc0282ecd4c35d970c8c20031 SHA-1: 9c2f6e0e7239d2cb6a0efdb97e3799d8e50178f3 SHA-256: e81df0d4c76e3df4eac2b9f77058ea3e607a551366ebf5a52aa393902967b7db
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, some pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit PDF vulnerabilities or contain embedded malicious content, possibly JavaScript, to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ambrose.edu/sites/default/files/webform/48232920683.pdf
    • https://aboss.by/sites/default/files/webform/vobefoxejajizagosoberob.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/fadubapep.pdf
    • http://seiary.com/sites/default/files/webform/rec/pexutagizoniged.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/sojinikud.pdf
    • https://www.a1touchsolution.nl/sites/default/files/73086307569.pdf
    • https://www.woonsocketri.org/system/temporary/webform/danajon.pdf
    • https://www.blplegal.com/sites/default/files/webform/julojulixizegusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shadow+and+bone+netflix+series
    • https://thesanfordschool.asu.edu/sites/default/files/webform/20850651402.pdf
    • https://community.princeton.edu/system/files/webform/36479690150.pdf
    • https://community.princeton.edu/system/files/webform/64301273598.pdf
    • https://lib.asu.edu/system/files/webform/bidemuf.pdf
    • https://lib.asu.edu/system/files/webform/90369837207.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d290.bin
816baa65b38fc5a5b41b90f3d17ca7677245b7b8ea97fb808e749f1ccc69da1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 5400 bytes
font_01_sfnt_off0000e4fa.bin
d79daf0fa0138ff9bf8d8c06c63c9baf7bc9af5cda53531a72bbedf5b700d70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10244 bytes

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