PDF malware analysis — malicious · d30729955ca35d81

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 09:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: bc1d825dc424ea0da5da18acb5e3066e SHA-1: dd0018e3a2ea67d86547c5c4a3503f87265ced00 SHA-256: d30729955ca35d81046eee2d5cc393a834d00d267205c6940fa523d4d7951ee8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ben+10+ultimate+alien+android+apk PDF link annotation
- http://newkontakt.ru/userfiles/images/file/52412416572.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/levopabijuseroralikupa.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/userfiles/file/wifufimijumi.pdfIn PDF document text
- http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lizisexagobudavegiwonize.pdfIn PDF document text
- https://sitycare.com/FCK-UserFiles/files/xopudoz.pdfIn PDF document text
- http://cabinet-blin.fr/ressource/site-image/files/lugogiwevorubasivup.pdfIn PDF document text
- https://menokatea.com/ckfinder/userfiles/files/tukezudusexajesopojiliwu.pdfIn PDF document text
- https://sentinels.ro/userfiles/file/napubajas.pdfIn PDF document text
- http://betonkeritesek.eu/Content/files/beritememiletozakorot.pdfIn PDF document text
- https://cissud.com/uploads/ck_editor/files/41691184263.pdfIn PDF document text
- https://tahitotfaluovodak.hu/ckfinder/userfiles/files/botile.pdfIn PDF document text
- http://litho-and-co.fr/ckeditor/upload/files/zeruvokife.pdfIn PDF document text
- https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/detuviwe.pdfIn PDF document text
- https://cometsecurity.in/admin/userfiles/file/papezeb.pdfIn PDF document text
- http://olsztyntransportmedyczny.pl/userfiles/file/vutajalakige.pdfIn PDF document text
- http://kuryakyn.ru/userfiles/file/24172429777.pdfIn PDF document text
- http://svatba-emi.com/uploads/pages/files/45162999350.pdfIn PDF document text
- http://thayloilocnuoctaihanoi.net/upload/files/bageguxedifibogigumoxisep.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/jabovaduvakakalanija.pdfIn PDF document text
- http://dga.gr/ILC/img/file/mosijij.pdfIn PDF document text
- http://abwingstop.com/uploads/files/dusujesedokinazelojabo.pdfIn PDF document text
- https://ikitellirezistans.com/upload/files/69111127811.pdfIn PDF document text
- http://hybsch.it/upload/file/18727486479.pdfIn PDF document text
- https://hsse.cl/files/bexusosikap.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_off0000b4db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ccf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCF2	10804 bytes
SHA-256: `1f0168f6e0a73935ada22f84965ce46639296cf302746d2d466419447aad3ad0`
`font_02_sfnt_off0000e5d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5D0	17672 bytes
SHA-256: `218ef4861e8b77bd1a45778f86df76b425cd13aa7620de0a92ffe34ecd918b58`

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