PDF malware analysis — malicious · 95e49f42ee5a057b

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 13:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b85d0921c49a3b3c5098bfe48a2a2ea7 SHA-1: c4723de4eb37c568450bd47e15291546f6567714 SHA-256: 95e49f42ee5a057b844686d0e66e38ce0820aa7f9a607076faf6f571c785e1f4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on domains suggestive of link farms or disposable content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 http://preiswerte-unterkunft-papenburg.de/mediapool/xumunopefizuzoga.pdf In PDF document text
- http://architettoannalisatinelli.it/userfiles/files/bagegegorajalarosijagevaw.pdfIn PDF document text
- http://atanasijornet.net/uploads/ckfinder/files/1073074760.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c403b42dc---61565103139.pdfIn PDF document text
- http://poslovniimenik.net/firme_data/files/jerefonuxiburitedasekane.pdfIn PDF document text
- https://bda.ch/ckfinder/userfiles/files/77274688874.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf61df741---tifexarisexituzamisuvoza.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/44535552435.pdfIn PDF document text
- http://i-p-p-c.com/ckfinder/userfiles/files/57052255529.pdfIn PDF document text
- http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/vumawifem.pdfIn PDF document text
- https://woft-dining.com/webroot/editor-uploads/files/laxugan.pdfIn PDF document text
- http://oawebserver.com/piceditor/file/mijibijodu.pdfIn PDF document text
- http://grafitym.kz/files/file/fipokujositibu.pdfIn PDF document text
- https://www.larche-de-jules.fr/ckfinder/userfiles/files/rirugenixijox.pdfIn PDF document text
- https://mintedimages.com/ckfinder/userfiles/files/49983544783.pdfIn PDF document text
- https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/36742050267.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/33046502024.pdfIn PDF document text
- https://fishboat.hr/files/donuzelezajata.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/fizumumatevuxovome.pdfIn PDF document text
- http://agmapure.com/upload/files/94423695405.pdfIn PDF document text
- http://jainfarms.com/uploads/varujazofaginafujevabegak.pdfIn PDF document text
- http://oilspecchem.com/files/20231161118.pdfIn PDF document text
- http://nontaromclinic.com/ckfinder/userfiles/files/wujopevogefegonapaseni.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+cartoon+guide+to+statistics+pdfPDF 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_off0000b8ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8EC	17080 bytes
SHA-256: `c31e5e8fbdffe16e222549fab2b81a1b17457077e0d525ddd7a303da3026f22a`
`font_01_sfnt_off0000e4de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4DE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fcf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCF5	10916 bytes
SHA-256: `42a4ae12a3e8f66bace9888defea720f9cd42495fcb0cd940ec58a424dcd1489`

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