PDF malware analysis — malicious · 368f638a1004fca6

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 03:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5dc885d1c78a22cb13f77e42ffb97f60 SHA-1: 371b5a459318f826348301b645feeab278c92796 SHA-256: 368f638a1004fca6d6ba75b772ebf0feb1878e9abb7fefd2d5b71077c03b4ae6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous external URLs, many hosted on disposable domains, point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://smidgel.ru/uplcv?utm_term=two+main+division+of+nervous+system PDF link annotation
- https://szabobuszberles.hu/files/files/38660063388.pdfIn PDF document text
- http://wxdyzs.com/userfiles/files/wuguduselefa.pdfIn PDF document text
- https://kop-trans.pl/uploads/userfiles/files/5314562806.pdfIn PDF document text
- https://krainaogrodow.eu/zdjecia/fck/file/923020453.pdfIn PDF document text
- http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mojix.pdfIn PDF document text
- http://abogadosaguilar.com/ckfinder/userfiles/files/62439654645.pdfIn PDF document text
- http://sxnqx.org/upload/file/Fl202109110421357412.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/69f248ec7a6105068c695881e69525ea/75842866355.pdfIn PDF document text
- https://gestcargo.com/uploadfiles/file/wawizetite.pdfIn PDF document text
- https://fratellifurloni.it/file/73132594824.pdfIn PDF document text
- https://zebcom.in/userfiles/file/pusurunadinesewe.pdfIn PDF document text
- http://woori-tour.kr/FileData/ckfinder/files/20210901_6F1E8E5324C2EDE5.pdfIn PDF document text
- https://k-newsletter.com/ckupload/files/nasijerabuvilubobobewereg.pdfIn PDF document text
- https://nullemont.fr/nullemont/ckfinder/userfiles/files/lofadelevixeravemezenik.pdfIn PDF document text
- http://hoilhpnqbthanh.com/upload/file/78295847566.pdfIn PDF document text
- https://pmms-online.com/assets/file/gufolifiti.pdfIn PDF document text
- https://baongochoa.com/upload/file/dopizakomexikizudirapox.pdfIn PDF document text
- http://bindashnews.com/userfiles/file/45950134211.pdfIn PDF document text
- https://swift-tw.com/lcc/upload/files/vowopibukuwafi.pdfIn PDF document text
- https://sikahaiphong.com/images/news/files/8267117984.pdfIn PDF document text
- http://youil.org/userData/board/file/miligipupixovonetipo.pdfIn PDF document text
- http://hatowo.com/app/webroot/uploads/files/45458216591.pdfIn PDF document text
- http://kipia-nn.ru/userfiles/file/834734894.pdfIn PDF document text
- https://devcons.org/uploads/userfiles/files/4223953084.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d786.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD786	10800 bytes
SHA-256: `69a9e678a8e8174b39dad3103495e872d8cc4c29fca4b8faa0884900defcc088`
`font_01_sfnt_off0000f07e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF07E	17604 bytes
SHA-256: `ac9cb19e0a3ce9121933162ddd6b25d98ee0c688a282c9af8995a47170c67ce8`
`font_02_sfnt_off00011e4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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