PDF malware analysis — malicious · a5399a958dcd5c6b

MALICIOUS

PDF

80.0 KB Created: 2021-04-23 17:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 71a92cdfd517a752ed3c026cad52261f SHA-1: 4d8a6347ba9be00be6ec61e3d56ed1299ff43aff SHA-256: a5399a958dcd5c6b5ed1a511e0c4664dbd1a3ffbfe4d334b987f4f2db1e2aa02

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 0.6542

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 https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf In PDF document text
- http://klm3fg.grhosting.cz/sites/default/files/webform/files/56601188302.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/49323480199.pdfIn PDF document text
- https://www.natsihwa.org.au/sites/default/files/webform/bukitonixoravutewoluba.pdfIn PDF document text
- https://www.a1touchsolution.nl/sites/default/files/64517041799.pdfIn PDF document text
- https://www.jwico.com/sites/default/files/webform/xojisipet.pdfIn PDF document text
- https://www.jts.org.jo/sites/default/files/webform/1653940235.pdfIn PDF document text
- https://www.visitsavannah.com/sites/default/files/webform/90994069376.pdfIn PDF document text
- https://www.a1touchsolution.nl/sites/default/files/larigujumikanezazezogiwi.pdfIn PDF document text
- http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdfIn PDF document text
- https://aboss.by/sites/default/files/webform/12404161593.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/fzgW7-mxBc0/uplcv?utm_term=shaolin+soccer+kung+fu+fighting+song+downloadPDF link annotation
- https://lib.asu.edu/system/files/webform/midari.pdfIn PDF document text
- https://www.vub.be/sites/vub/files/webform/ludazerubadariwevulefaxu.pdfIn PDF document text
- https://thesanfordschool.asu.edu/sites/default/files/webform/83703622856.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
`font_00_sfnt_off00010577.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10577	2880 bytes
SHA-256: `82364c4055ab4f190e2bf62915cdc8d4c13efe9d89646545546c571e6dc77bd0`
`font_01_sfnt_off00010fb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FB8	5540 bytes
SHA-256: `219280c59fd2da8a6a39f33eca33401ceda8a17e253324065e0f52d1c9b62e91`

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