PDF malware analysis — malicious · b41471ca7a5596d8

MALICIOUS

PDF

89.6 KB Created: 2021-09-20 03:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4a339ced08abecd347061ddb2429e2f9 SHA-1: b3d327e37974e25bc455d1840d5fbab0b5058408 SHA-256: b41471ca7a5596d8d8288f44f72c809661cd8b99977bd91424f5d97f2407afc8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

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://nomylo.ru/uplcv?utm_term=adb+command+not+found+on+mac PDF link annotation
- http://hotelamadeustorino.com/userfiles/files/jajopanorelijof.pdfIn PDF document text
- https://ferest.ro/imagini_ws/56470384771.pdfIn PDF document text
- http://mtecommerce.it/public/news/file/faranixomuwefazojotel.pdfIn PDF document text
- http://gr-chem.com/upload/files/xipupelefivaxigisuj.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c79ee73e567c527dfa665faa762fa2b3/linolijujovadeja.pdfIn PDF document text
- http://arsvet.ru/img/upload/44499695988.pdfIn PDF document text
- http://toyteepee.com/uploadfiles/file/210908224424460957hpxu4a.pdfIn PDF document text
- https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zagofedokolisejowixuri.pdfIn PDF document text
- http://euroear.eu/ckfinder/userfiles/files/gemalelifufidix.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/lovesagunitojek.pdfIn PDF document text
- https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/78483699221.pdfIn PDF document text
- http://aquatherm-graz.at/files/vagef.pdfIn PDF document text
- http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/51869812485.pdfIn PDF document text
- https://callmarkinvestments.fortunekenya.com/callmark/files/53733899441.pdfIn PDF document text
- https://yuvasarkar.org/userfiles/file/54101747936.pdfIn PDF document text
- http://rlangkhan.com/upload/userfiles/files/5926015730.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16145e2f227716---loneborin.pdfIn PDF document text
- http://ylplj.com/ckfinder/userfiles/files/lejeguzovezixelenotazof.pdfIn PDF document text
- http://wdnederland.nl/file/wijidegivuzesaz.pdfIn PDF document text
- http://perfekt-dom.pl/designhome/admin/userfiles/file/dosupuwujifawewotosuz.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/70289852376.pdfIn PDF document text
- http://salocchi.it/userfiles/files/42674048906.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/41633775769.pdfIn PDF document text
- http://okvin.org/userfiles/file/zejolinatimisizidu.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_off0000ecae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECAE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000104c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C0	23372 bytes
SHA-256: `d03fe56e90f7e82dc3041f1c81f3c65e54129990200b4e05d1f798d73e323473`
`font_02_sfnt_off00014109.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14109	10320 bytes
SHA-256: `6820cef02ddcc47abe9edc52bee565adabefb3dca0aff6543953f84d20c57e2f`

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