PDF malware analysis — malicious · e3959290ef1df624

MALICIOUS

PDF

57.0 KB Created: 2021-04-13 13:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17

MD5: ea8980379c6b18fa7efb0307575c91df SHA-1: d1d836b8a2aea3750a7245d046add825e8c0a6a8 SHA-256: e3959290ef1df624f1e9c78dcced833ed5125b51c3c09d1cd9c113930aab1ec7

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites. The presence of multiple distinct hosts in the link farm heuristic points towards a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.8068

Heuristics 4

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
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.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf In PDF document text
- https://www.jwico.com/sites/default/files/webform/minokoniniwige.pdfIn PDF document text
- http://cicatsalud.com/html/sites/default/files/webform/28693943460.pdfIn PDF document text
- https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdfIn PDF document text
- https://www.uts.cw/sites/default/files/webform/96040264728.pdfIn PDF document text
- https://www.mothercare.ro/sites/default/files/webform/resumes/95866450710.pdfIn PDF document text
- https://www.pharoxglobal.com/sites/default/files/webform/50635107556.pdfIn PDF document text
- http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdfIn PDF document text
- http://oaklandchildcare.org/sites/default/files/webform/55178968397.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/A3Ryygt5BCM/uplcv?utm_term=funcion+inversa+ejercicios+resueltosPDF link annotation
- https://gradfutures.princeton.edu/system/files/webform/49692556615.pdfIn PDF document text
- https://www.healthdata.org/sites/default/files/resumes/sametuzovu.pdfIn PDF document text
- https://gradfutures.princeton.edu/system/files/webform/fumegefexuwonadijot.pdfIn PDF document text
- https://campusrec.princeton.edu/system/files/webform/popikinof.pdfIn PDF document text
- https://ec.europa.eu/eip/agriculture/sites/default/files/webform/76225898136.pdfIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ced2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCED2	4768 bytes
SHA-256: `2c403c212dbfe6feea4a8f788a2f0b8f6ce3c0766c3b0013f3bda43c3215bf4f`

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