PDF malware analysis — malicious · 1b7bbe58b5fafa41

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 12:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b13177ff75c0c9ac5c3d69ec4a175201 SHA-1: 966c19ff235f6ae23218a0ccdae941b026109176 SHA-256: 1b7bbe58b5fafa41afeda7b1dcb67e551fac1442ff5e890b31f483f2832ead76

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely facilitates redirection to malicious sites, as suggested by the numerous unknown-reputation URLs extracted. The PDF structure and the presence of JavaScript point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://www.jindatunnel.com/up_files/file/bawimetibonozunibam.pdf In PDF document text
- https://lecormier-menuiserie.com/www/upload/files/53943818807.pdfIn PDF document text
- http://phuongdonggolf.vn/app/webroot/uploads/files/lizevirekebawig.pdfIn PDF document text
- http://asu78.ru/userfiles/file/bibikikivexazenuson.pdfIn PDF document text
- http://hostingureitings.lv/uploads/userfiles/files/40826054725.pdfIn PDF document text
- https://mkontakt.pl/dat/file/74509584508.pdfIn PDF document text
- http://elfuklid.cz/foto/Image/file/paseluvodon.pdfIn PDF document text
- https://ver9.sonikgps.com/ckfinder/userfiles/files/fozamegatukajawolozirolum.pdfIn PDF document text
- https://beytarimcilik.com/admin/editor_resim/file/66943038685.pdfIn PDF document text
- http://pate4me.com/userfiles/file/zarajavozavugekilikujodo.pdfIn PDF document text
- https://brod-plovdiv.com/images/21059691606.pdfIn PDF document text
- https://chulintemple.org/CKEdit/upload/files/91227559115.pdfIn PDF document text
- http://architects-desk.com/uploadsfile/94195238645.pdfIn PDF document text
- http://www.kotolantopeni.cz/files/kukekejosigupixi.pdfIn PDF document text
- https://ciar.vn/uploads/image/files/53310667888.pdfIn PDF document text
- https://washlounge.in/ckfinder/userfiles/files/74329196361.pdfIn PDF document text
- http://www.contectrade.hu/fckfiles/file/zukenuxoxobe.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/40615577925.pdfIn PDF document text
- http://daegyung.kr/userfiles/file/20210910150913.pdfIn PDF document text
- http://xn--80ab1a9a.xn--p1ai/sadm_files/53107603866.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352c3fce466---18498493472.pdfIn PDF document text
- http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/92288519316.pdfIn PDF document text
- http://nppgursaraijhansi.in/ckfinder/userfiles/files/44846361763.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+online+watching+movies+websitePDF 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_off0000f8d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8D4	10924 bytes
SHA-256: `de2bf8e1a5c4620fd0741db94577c1915d0951b6bf75e7a52dd84178e66f3710`
`font_01_sfnt_off00011211.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11211	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012a23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A23	17556 bytes
SHA-256: `82c5916d89d88a1e3fee49c7cd2472cfbbc692f730c212458d0b8f8efa8c8308`

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