PDF malware analysis — malicious · d297f2e45e1c9f87

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 19:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 58db861f1d483da661bd04309c993de8 SHA-1: 4ce49bddf3e2bf4b3750a06fb77c7ed766fd0811 SHA-256: d297f2e45e1c9f8756f7e07b9c3c1a5c1941ee055e39d35e8b9326b60a6d318f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic point to a malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

Heuristics 5

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
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://synerhu.ru/uplcv?utm_term=avoir+verb+conjugation+in+french PDF link annotation
- http://ambvetsanprospero.eu/userfiles/files/49846349415.pdfIn PDF document text
- https://alpinebadmintonacademy.com/ckfinder/userfiles/files/33166777148.pdfIn PDF document text
- https://kidneystonetreatment.in/userfiles/files/xowadinolujevowaxopate.pdfIn PDF document text
- http://rc-mst.com/mst/_upload/files/26078570660.pdfIn PDF document text
- http://immodraft.nrw/images/architekten_agentur_images_/file/42093901524.pdfIn PDF document text
- https://przyklejki.pl/userfiles/rezuzav.pdfIn PDF document text
- http://cowmoo.org/ckfinder/userfiles/files/73624415276.pdfIn PDF document text
- https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/gamimufiwu.pdfIn PDF document text
- http://kukdae.com/files/fckeditor/file/fetazutokalewumexene.pdfIn PDF document text
- https://kidneystonetreatment.in/userfiles/files/kobikikeragemugojizazoji.pdfIn PDF document text
- http://dpkwi.org/userfiles/files/67915941762.pdfIn PDF document text
- https://bhopalliteraturefestival.com/mpsdp/uploads/files/lojekikumikij.pdfIn PDF document text
- http://yenidenyuzlendirme.com/ckfinder/userfiles/files/nejaza.pdfIn PDF document text
- https://vico-inmobiliaria.com/ckfinder/userfiles/files/netereburevowojazofumi.pdfIn PDF document text
- https://birudongker.com/contents/files/74811017542.pdfIn PDF document text
- http://fd-health.com/upload/ckeditor/files/79193903690.pdfIn PDF document text
- http://villapellegrino.it/userfiles/files/fotezopekomopimixen.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9a893efc---79863165601.pdfIn PDF document text
- http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebukiwigerugevanuwipewak.pdfIn PDF document text
- http://studioingegneriavaragnolo.com/userfiles/files/43660775879.pdfIn PDF document text
- http://acsalma.hu/userfiles/files/84043337407.pdfIn PDF document text
- https://buzascsaba.hu/userFiles/file/49170870408.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/e4ta56cft2qlq3ksv8vslicun6/87831599610.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBEF	10820 bytes
SHA-256: `e575ab7c1dcb705c2d61c065c9a2e4505c40c80c0df37098544184f7b7549dd0`
`font_01_sfnt_off0000f4e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010cf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CF4	19904 bytes
SHA-256: `f2ac861191a724e4f98ad466bac081d0e396801d642ff5d8a0753776338e5990`
`font_03_sfnt_off00013ffb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FFB	16232 bytes
SHA-256: `e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5`

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