PDF malware analysis — malicious · 53f4987f35e03131

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 02:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: de582897ad2ccb24844c9e99458390c1 SHA-1: 1932a15c233756345a442e043441efcf6ab93e4d SHA-256: 53f4987f35e0313184d6f7ee85096ea95802d165a95d689bea239f938fdf744c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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
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://doina.md/fckeditorfiles/file/savuzukibokagutagijalevi.pdf In PDF document text
- https://francemonde.news/UserFiles/file/tarigota.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d67071130---11428468261.pdfIn PDF document text
- https://tlproduct.com/userfiles/file/zikugefoxo.pdfIn PDF document text
- http://lotusromeo.fr/app/webroot/files/userfiles/files/bebuneveworexoturonu.pdfIn PDF document text
- https://rtvpuls.com/ckfinder/userfiles/files/vimafuzesudamewawive.pdfIn PDF document text
- http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/70261771085.pdfIn PDF document text
- https://prestinieurope.com/userfiles/files/19630882733.pdfIn PDF document text
- https://matfplayer.com/calisma2/files/uploads/89646018329.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420d5232e3e---73867267770.pdfIn PDF document text
- http://kant21.com/userData/board/file/33482916225.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/28024366547.pdfIn PDF document text
- http://caerulumpharma.com/upload/files/gujipekefoxumomexuragoxap.pdfIn PDF document text
- http://cravaluos.com/ckfinder/userfiles/files/nokoxufevewubo.pdfIn PDF document text
- http://phongthuydotho.vn/upload/files/38314780880.pdfIn PDF document text
- http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/podix.pdfIn PDF document text
- https://resttour.com/images/userfiles/files/lugukuju.pdfIn PDF document text
- http://seoulmenu.com/uploads/files/pibolisifewudopugepisepaf.pdfIn PDF document text
- http://taemyung.com/data/upload/file/madobigoreziwadisemagoxu.pdfIn PDF document text
- http://raczcsalad.hu/files/tubeguxok.pdfIn PDF document text
- http://www.saaegfpolis.org.br/ckfinder/userfiles/files/24771377613.pdfIn PDF document text
- https://gujaratisamajparis.org/upload/files/somapekeli.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+phone+as+webcam+via+usbPDF link annotation
- 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_off0000e786.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE786	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9D	11008 bytes
SHA-256: `b447ba5f5281e584ece871d1bc0f848064caf2fe56b45670e3faca105cbc1b95`
`font_02_sfnt_off000118d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118D5	17620 bytes
SHA-256: `f64747e9b851adcee2f3ec85b6d93b8cc0703c285ec215d91b2f4052d8872e1c`

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