PDF malware analysis — malicious · 1ac455eced513862

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 10:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 1682ef9293c5828fd4214010c6b53c83 SHA-1: e6b877a05442888c3ec5e2ad0f501eba3c6be985 SHA-256: 1ac455eced513862f2cf82e5e7434cbab47710a572bd09abb0dbe9a00f3b80aa

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are used in a link farm configuration. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://allytemp.ru/uplcv?utm_term=borrar+historial+navegador+android PDF link annotation
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614676e80f273---jisonize.pdfIn PDF document text
- http://inbeeldt.nl/userfiles/file/64703241592.pdfIn PDF document text
- http://unitez.net/images/newtech/files/92630849071.pdfIn PDF document text
- http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4491199026.pdfIn PDF document text
- http://yuemeism.com/uploadfiles/files/37191198577.pdfIn PDF document text
- http://garage-ys.info/js/upload/files/bejiziwupigovilini.pdfIn PDF document text
- http://revucue.com/ckfinder/userfiles/files/22136820617.pdfIn PDF document text
- https://satellietgroep.nl/userfiles/files/96729744228.pdfIn PDF document text
- https://alternatifhirdavat.com/upload/ckfinder/files/vemulevezuruzikegezumamaf.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/21320929461.pdfIn PDF document text
- http://jujucuisine.com/userfiles/file/badujenogarevuketeteme.pdfIn PDF document text
- http://ud2-140.com/files/kadol.pdfIn PDF document text
- http://charivne.info/images/file/kuwadoferomeruveraxakup.pdfIn PDF document text
- http://awfiowv.love-mrt.com/upload/files/74755196707.pdfIn PDF document text
- http://reckdance.pl/userfiles/file/xusevubuw.pdfIn PDF document text
- https://thegmsbihta.in/userfiles/file/90445072003.pdfIn PDF document text
- http://qianshunqs.com/admin/upload/10111890466.pdfIn PDF document text
- http://racecross.com/upload/edito_fckeditor/file/wawoxibobejizo.pdfIn PDF document text
- https://jaukiaplinka.lt/ckfinder/userfiles/files/36701448261.pdfIn PDF document text
- http://blpest.com/UserFiles/file/62780331110.pdfIn PDF document text
- http://branonperformance.com/ckfinder/userfiles/files/xotikimuguj.pdfIn PDF document text
- http://federicozucchettiarchitetto.eu/userfiles/files/lexiw.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dabe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDABE	10648 bytes
SHA-256: `5877cd3343a3642bdc286fd57216b514cac2cfd32b56c7caeacdfe12b15c18f9`
`font_01_sfnt_off0000f2e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2E1	18836 bytes
SHA-256: `d2f6c5062471ead96deebd393102765ff2fc6a2f788ace3ef98e91e06f70caa8`
`font_02_sfnt_off000122bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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