PDF malware analysis — malicious · 2501a543e8853a44

MALICIOUS

PDF

77.4 KB Created: 2021-04-26 15:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: 1da5f744dc52e85925024bff49380a33 SHA-1: 304e9b83db001f945760a240da6fec2331a3e94b SHA-256: 2501a543e8853a449b362ec7c6d643a51c08c73f0b25cfc283feca9b78cc050c

96 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 presence of embedded URLs, some of which are marked as unknown reputation, suggests the document is part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', which could be used to disguise the true nature of the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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
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.jwico.com/sites/default/files/webform/xojisipet.pdf In PDF document text
- https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdfIn PDF document text
- https://www.pharoxglobal.com/sites/default/files/webform/zomufajiwadusepa.pdfIn PDF document text
- https://www.natsihwa.org.au/sites/default/files/webform/72789215659.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/54125375098.pdfIn PDF document text
- https://www.uts.cw/sites/default/files/webform/96040264728.pdfIn PDF document text
- https://www.pharoxglobal.com/sites/default/files/webform/balulata.pdfIn PDF document text
- https://www.uts.cw/sites/default/files/webform/vogoledifekotukedadawen.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/nakevatekiviva.pdfIn PDF document text
- https://www.gutIn 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/BkSY9tpko7c/uplcv?utm_term=bertrand+russell+mathematical+philosophy+pdfPDF link annotation
- https://minorsoncampus.princeton.edu/system/files/webform/zotatati.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f22a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF22A	5544 bytes
SHA-256: `b4bbc66ff0add0ce6ada6d97cccae545a9f42d445a589010ed66c90e3cecc28c`
`font_01_sfnt_off000104e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104E5	10772 bytes
SHA-256: `5ed4805dc137775c987fff9ef280126f134d5099d63259b7adedbb182bc2d784`

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