PDF malware analysis — malicious · e68fd227b314f178

MALICIOUS

PDF

73.7 KB Created: 2021-09-10 14:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 977532990cef4359defb15834d68ebb3 SHA-1: 3a96fc29e11da4574940dced1f40ad233052c7c9 SHA-256: e68fd227b314f178a0d41620a9ee44724aee5cf790c8e6cc5838e4966a90869a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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://crewmak.ru/uplcv?utm_term=the+best+alarm+clock+app+for+android PDF link annotation
- http://krasneclanky.cz/uploads/81032616861.pdfIn PDF document text
- http://aerotechgroup.ru/img/outer/files/dexopi.pdfIn PDF document text
- https://rijst.nu/userfiles/file/65374953055.pdfIn PDF document text
- http://cabanagarden.hu/editor_up/64360130322.pdfIn PDF document text
- https://www.geya99.com/ckfinder/userfiles/files/26681320697.pdfIn PDF document text
- http://greathorserider.com/ckfinder/userfiles/files/bafezobikokof.pdfIn PDF document text
- http://gaushalango.com/uploaded_files/userfiles/files/94785018787.pdfIn PDF document text
- https://saunadlaciebie.pl/userfiles/file/givefavanit.pdfIn PDF document text
- http://vit-physio.de/file/busovuvevavij.pdfIn PDF document text
- https://papersacksfactory.ae/images/bulk_images/files/59278527438.pdfIn PDF document text
- https://shian-jin.com/UserFiles/files/gagiwixuledezevanud.pdfIn PDF document text
- http://yejiya.com/userfiles/file/7650292962.pdfIn PDF document text
- https://spitalmoldovanoua.ro/ckfinder/userfiles/files/2817848681.pdfIn PDF document text
- https://www.zochrot.org/ckfinder/userfiles/files/jineborarin.pdfIn PDF document text
- http://piotrkowska77.pl/zdjeciafile/lajirirawodoxewofazo.pdfIn PDF document text
- http://diencongnghiepvohoang.com/uploads/files/guladakuzevelikeletijag.pdfIn PDF document text
- http://baby-daycare.com/uploads/files/202109032019426478.pdfIn PDF document text
- https://surupaceanu.ro/ckfinder/userfiles/files/35118470586.pdfIn PDF document text
- http://theponghop.com/upload/files/62483434470.pdfIn PDF document text
- http://winecellarkeeper.com/ckfinder/userfiles/files/62049300876.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8e9ec77d---vododozatizetem.pdfIn PDF document text
- http://www.mostenpo.jp/userfiles/files/91526008170.pdfIn PDF document text
- https://maurinet.com/userfiles/file/2548479132.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fabagorozezixisibovez.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_off0000bd17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD17	11080 bytes
SHA-256: `45f940c1acbb0d56fefbf8bb9d17357bd6ea977fd7b4202416d975f59e22a14d`
`font_01_sfnt_off0000d687.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD687	16568 bytes
SHA-256: `b2dfaf9739f4d4a876fb2115c5f64762ac19308c490b1eed4d0b445115dffbc6`
`font_02_sfnt_off00010106.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10106	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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