PDF malware analysis — malicious · db0b320cb5975e44

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 02:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e1f3d27839041498f2a38e580290b81d SHA-1: 625599dc3d09e0f8b64a1f8f91f8f0d56485abeb SHA-256: db0b320cb5975e44d208fa706b90c1b6704403663b9b8a5af88f464280933436

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are organized as a link farm, suggesting a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://infrive.ru/uplcv?utm_term=fmovies+watch+free+movies+online PDF link annotation
- http://myucpb.net/userfiles/file/vekukitotiro.pdfIn PDF document text
- https://bengalroys.com/ckfinder/userfiles/files/88042659539.pdfIn PDF document text
- https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/ritamamisukixomabasefeg.pdfIn PDF document text
- https://alutat.com/data/file/26987057408.pdfIn PDF document text
- http://addisonplaza.abwingsmd.com/uploads/files/zofebebiwowuxawazewederaj.pdfIn PDF document text
- https://pamukoglu.com/userfiles/file/42539068746.pdfIn PDF document text
- http://abwingsbuffalo.com/uploads/files/32645805363.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/menoj.pdfIn PDF document text
- http://buyyoutubelikes.com/ci/userfiles/files/fupesunoxagus.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f25feb08e---fedobolizoxuti.pdfIn PDF document text
- http://hnc2.com/userfiles/file/70437063955.pdfIn PDF document text
- https://cursosadistanciayonline.com/medios/files/jigimujo.pdfIn PDF document text
- http://makinsushi.com/uploads/files/peliwudegixe.pdfIn PDF document text
- http://bjqyms.com/filespath/files/20210909201002.pdfIn PDF document text
- http://sjmhospital.org/files/js/ckfinder/userfiles/files/60631686901.pdfIn PDF document text
- https://abouelhoulgroup.com/userfiles/files/18257028018.pdfIn PDF document text
- https://mimpisiluman.com/contents/files/77329770772.pdfIn PDF document text
- https://sindhuinvestment.com/ckfinder/userfiles/files/9904350460.pdfIn PDF document text
- http://www.mariabeckmann.com/fotos/uploads/files/15083715066.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/67030325867.pdfIn PDF document text
- http://habitat3.eu/userfiles/files/lirirawumekijaxadexuvoxa.pdfIn PDF document text
- http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67407262846.pdfIn PDF document text
- http://inphuduong.vn/upload/files/33635051865.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/zitiw.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_off0000f98a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF98A	17820 bytes
SHA-256: `ac1380fdb56017dc4a3f2c000c8d81315d3612b18f6be9d6526108dac79bbce8`
`font_01_sfnt_off0001278b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1278B	10732 bytes
SHA-256: `4b33722897f1deed20fb5756743913409b92b81a63588f183dd5bb934c15fdc6`
`font_02_sfnt_off0001400f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1400F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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