PDF malware analysis — malicious · bfea31a2c1e0872b

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 20:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f3ba3b586deb8b90b4b06300a96df327 SHA-1: f7a7ce0953c018d30a54858d8decf94af16e31ef SHA-256: bfea31a2c1e0872ba6f966ee7142b5b1e435868298930b0352068eab837dd94d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, with critical and high severity heuristics indicating its suspicious nature. The presence of embedded JavaScript and a large number of external URIs, many pointing to PDF files on various domains, strongly suggests a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm designed for obfuscation or redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://institutdesante.org/userfiles/file/jivaza.pdf In PDF document text
- http://praguynakorn.com/praguynakorn/picture/datapro/files/jazitetinisumabezixodi.pdfIn PDF document text
- http://abc-tel.ru/data/File/vokoburoderejabeg.pdfIn PDF document text
- https://bcm.es/files/galeria/files/41583063563.pdfIn PDF document text
- http://bannermaul.com/userData/board/file/rokaniwavanapikajebajot.pdfIn PDF document text
- http://www.bluefashion.cz/ckfinder/userfiles/files/79684949848.pdfIn PDF document text
- https://snpwachq.com/files/js/ckfinder/userfiles/files/31905047527.pdfIn PDF document text
- http://gruppocreta.com/userfiles/files/29798242150.pdfIn PDF document text
- http://massageindex.nl/images/uploads/weludaf.pdfIn PDF document text
- https://kalimati.in/userfiles/file/pagewekepiwedegekevegebi.pdfIn PDF document text
- https://rumahbaruku.com/contents/files/nowuvimawomizeboriz.pdfIn PDF document text
- http://bananamusic.tw/uploads/files/202109080711201659.pdfIn PDF document text
- https://shoppingplanet.ro/ckfinder/userfiles/files/9922128318.pdfIn PDF document text
- http://hungthanhauto.com/luutru/files/makoxuxerigobofukotakijak.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/58q265qp30om3mb16a4o48licp/43092010026.pdfIn PDF document text
- http://daejonggyoyc.com/userfiles/file/20210906093855.pdfIn PDF document text
- http://bidmitt.com/img/files/file/jazogotawagetuko.pdfIn PDF document text
- http://digivideos.net/ckfinder/userfiles/files/25691009029.pdfIn PDF document text
- http://carsonpokebar.com/uploads/files/17056857710.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/86418506981.pdfIn PDF document text
- https://meritumptt.pl/dokumenty/file/67573946917.pdfIn PDF document text
- https://nhahangthanghuong.com/uploads/files/62546614203.pdfIn PDF document text
- https://semineebrasov.ro/printuri-fi/files/wenufopenedowabamixuzo.pdfIn PDF document text
- https://xo-sound.ru/userfiles/file/6965420625.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+call+putlockerPDF 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_off0000b958.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB958	19360 bytes
SHA-256: `4958a8942dfccdaf8c69623306fbcb14151ca74032d04dc9ac9d63fbfe02c2e5`
`font_01_sfnt_off0000ebc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000103d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103D8	10264 bytes
SHA-256: `138ccefe4a8139398982258f9299cc1af706f70f82683563e19525a055d4e41d`

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