PDF malware analysis — malicious · 458d9762f8ca34c2

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 01:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5e62956ef37976dc0838ed32899c6d0e SHA-1: 23e68fbdaf1d0685436b5e99ad355c4392ec2b45 SHA-256: 458d9762f8ca34c251d4e644b62e41db5d05ac3b262555c457cd73a60a30c08f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://oniceh.ru/uplcv?utm_term=how+to+cite+a+picture+apa PDF link annotation
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/ruwawobali.pdfIn PDF document text
- http://hoinhikhoavn.com/img/files/ponerobiruvefaguwi.pdfIn PDF document text
- https://motoralbini.it/files/file/xawofabopewemadaf.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4643fba2---79325946410.pdfIn PDF document text
- https://onderdurdu.com/upload/ckfinder/files/katubazaredubazobuzaj.pdfIn PDF document text
- https://ilonew.tasksplan.com/userfiles/files/newenawagafowukanil.pdfIn PDF document text
- http://stlnsk.ru/uploads/file/jajuz.pdfIn PDF document text
- https://makojudo.pl/zdjecia/fck/file/99907870989.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1631858385.pdfIn PDF document text
- http://zuszdounky.cz/files/zumexuxozopazogifugiw.pdfIn PDF document text
- https://orangerun.re/photo/files/91895567034.pdfIn PDF document text
- http://rockpapersun.com/upload_mce_image/file/1839498833.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a29f49181---jujaturumibat.pdfIn PDF document text
- https://www.ebenisterie-burette.com/ckfinder/userfiles/files/jebizeri.pdfIn PDF document text
- http://quimis.net/js/ckfinder/userfiles/files/duguwatif.pdfIn PDF document text
- https://totalsewa.com/userfiles/file/7347225280.pdfIn PDF document text
- http://ansatrans.ru/admin/ckfinder/userfiles/files/94343596910.pdfIn PDF document text
- http://ruihuitax.com/files/file/91337225953.pdfIn PDF document text
- https://sabresources.com/FCKuploads/file/79839429211.pdfIn PDF document text
- https://easternresources.net/ckfinder/userfiles/files/83844398573.pdfIn PDF document text
- http://brcassociati.com/userfiles/files/2464758328.pdfIn PDF document text
- http://sydjpg.com/images/upload/file/20210918_043102_177.pdfIn PDF document text
- http://rutka.pl/media/upload/files/23c71e16617569d890ba0e88bc135482.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_off0000e881.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE881	18044 bytes
SHA-256: `bda0cd688da00ef64883eeb778157d9e5bb50022accafab6c32c70cc2159ea4c`
`font_01_sfnt_off000117a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012fb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FB7	10224 bytes
SHA-256: `e935e68f0a9c3758092c86ad60dea82af40d5980840b08ba0036adf5b6d1be61`

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