PDF malware analysis — malicious · 98f4b0e914fd97b0

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 05:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 471e5992ac6437d0b866ca9560adeee1 SHA-1: 9821c52566f836c3711a569502d9304d77165e24 SHA-256: 98f4b0e914fd97b0ee26bf772fa5af3d7fe36619947e73af04fa3011dabba653

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious websites. The presence of embedded JavaScript (T1059.007) indicates potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9958

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://lrm.mcdonalds.ua/ckfinder/userfiles/files/2386103090.pdf In PDF document text
- http://energo-winstal.pl/userfiles/file/77739922951.pdfIn PDF document text
- https://farmaciasacoor.com/site/upload/file/dotovobevagupomed.pdfIn PDF document text
- https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/fagulidagewijabesurodibo.pdfIn PDF document text
- https://cakesandcupcakes.net/userfiles/files/91438563015.pdfIn PDF document text
- https://magiccat.pro/ckfinder/userfiles/files/wetidajotav.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ddd48f46e---46832194838.pdfIn PDF document text
- https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/38847932152.pdfIn PDF document text
- http://skulpt.in/admin/uploads/file/pesosewizu.pdfIn PDF document text
- http://langmypham.com/luutru/files/fadewajepaluvezukazozo.pdfIn PDF document text
- http://addisonplaza.abwingsmd.com/uploads/files/xomibadawumarimer.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/xonotusixito.pdfIn PDF document text
- http://abwingsde.com/uploads/files/zaloge.pdfIn PDF document text
- https://eastoncn.housemember.com/uploads/files/zazafubunokikogetulazap.pdfIn PDF document text
- https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/88140576151.pdfIn PDF document text
- https://latrinquette.com/upload/editor/file/kagelekil.pdfIn PDF document text
- https://xn--hjrnskadeakademien-mtb.se/userfiles/file/18107665239.pdfIn PDF document text
- http://chinalabware.ru/d/files/95736374123.pdfIn PDF document text
- http://telek-trans.hu/editor_up/40587299022.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/76008601620.pdfIn PDF document text
- https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/76394157399.pdfIn PDF document text
- http://graciaindoutama.com/kingkong/userfiles/files/kigabobatoxe.pdfIn PDF document text
- http://abwlargo.com/uploads/files/85896596403.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yify+official+home+pagePDF 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_off0000d35c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD35C	10552 bytes
SHA-256: `b2099394f80b15290f130b66663a9753f6446bce884c146955cacf1233b6a3c7`
`font_01_sfnt_off0000eb5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB5E	17128 bytes
SHA-256: `2d7902fef29d7199b1b0e577e9e1e12c6783b57fda75305a08ea5a625a32f923`
`font_02_sfnt_off00011747.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11747	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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