PDF malware analysis — malicious · c3ff18317315d79f

MALICIOUS

PDF

142.7 KB Created: 2021-04-09 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22

MD5: 43d33b1f4e56ac36bd16f24ca94795d6 SHA-1: 4d410967d4225e74fc26f650e0f7936fdcc3db94 SHA-256: c3ff18317315d79f326fd7043298d5441b35ef7e4d94b5cf109a3dbb6309fa4f

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.8006

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 http://portal-mysigma.com/system/files/student-proof/41429692510.pdf In PDF document text
- https://ambrose.edu/sites/default/files/webform/85138354947.pdfIn PDF document text
- http://cicatsalud.com/html/sites/default/files/webform/21030689395.pdfIn PDF document text
- https://www.clinicasfantamaria.ro/sites/default/files/webform/33767122539.pdfIn PDF document text
- http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdfIn PDF document text
- http://www.pbttphtk.gov.my/sites/default/files/webform/xaduxiwipel.pdfIn PDF document text
- https://www.natsihwa.org.au/sites/default/files/webform/51762260361.pdfIn PDF document text
- https://www.a1touchsolution.nl/sites/default/files/73086307569.pdfIn PDF document text
- https://www.jwico.com/sites/default/files/webform/kupoxogij.pdfIn PDF document text
- https://architecturaldesigninc.com/sites/default/files/72694480293.pdfIn PDF document text
- https://www.ofalloncasting.com/sites/default/files/webform/34904816646.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/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=blast+furnace+process+control+pdfPDF link annotation
- https://ec.europa.eu/eip/agriculture/sites/default/files/webform/56905881998.pdfIn PDF document text
- https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/xegenaxug.pdfIn PDF document text
- https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.pdfIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000dce5.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xDCE5	110692 bytes
SHA-256: `9c8b036fa4997d744642493c530a3a511846b3486741d135410dd18b82fb465d`
`font_01_sfnt_off0002259c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2259C	5200 bytes
SHA-256: `00b39088c92a310296b26b4509f3f1e940ff4da2e635fb9ec19c8a9b391fb0b1`

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