PDF malware analysis — malicious · 61f08cb07d905204

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 12:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 790902f8b50a9fe96c15e877d4623028 SHA-1: a7877a118c8cb68fd52856a6de6386154f5f9a8b SHA-256: 61f08cb07d9052046904ff55435b0cc79aa63fa5061aec12c5a603bcc34f3a67

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 potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the PDF's purpose is to act as a gateway to a large collection of other files hosted on disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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://infrive.ru/uplcv?utm_term=mega+show+apk+for+android PDF link annotation
- http://webcertain.net/contentupload/fckeditorUploads/organization_/file/57391802972.pdfIn PDF document text
- http://rcot.by/pics/files/xuzagukupenufotu.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/legidoraxokinuv.pdfIn PDF document text
- http://insureavisitor.com/userfiles/file/vofaditizinipu.pdfIn PDF document text
- http://ottuk-e.org/userData/board/file/55194954993.pdfIn PDF document text
- https://auto826.vnpec.xyz/uploads/files/wolagafodifatepe.pdfIn PDF document text
- http://aadcnfgl.netsociality.com/upload/files/17296214096.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/30800613343.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76bd829a---84569203770.pdfIn PDF document text
- http://huichem.com/ckfinder/userfiles/files/42934916939.pdfIn PDF document text
- https://vietnam-pump.com/userfiles/file/38299344255.pdfIn PDF document text
- https://skiclubraonbaccarat.fr/pdf/18564830746.pdfIn PDF document text
- https://noriupapildu.lt/ckfinder/userfiles/files/januvenisonokim.pdfIn PDF document text
- https://molecult.metallo-tests.ch/sites/web/upload/files/fakewatuw.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/kifepuvimiv.pdfIn PDF document text
- http://avtrak.ru/ckfinder/userfiles/files/nolebudabajabeni.pdfIn PDF document text
- http://tjsyjdq.com/v15/Upload/file/2021952329584160.pdfIn PDF document text
- http://share-world.tw/userfiles/file/lorutasakanetufi.pdfIn PDF document text
- http://rc-mst.com/mst/_upload/files/susibiv.pdfIn PDF document text
- http://mastervin.ru/files/file/dofasijufi.pdfIn PDF document text
- https://cosplay-expo.it/ckfinder/userfiles/files/2363037774.pdfIn PDF document text
- https://u-spot.biz/js/ckfinder/userfiles/files/6487777433.pdfIn PDF document text
- http://kovove-ploty-brany-zabradli.cz/UserFiles/File/sozugunikutilirimuxiwor.pdfIn PDF document text
- http://saddabro.com/userfiles/file/709616447.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_off0000c33a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC33A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000db4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB4C	17800 bytes
SHA-256: `d9a1cbd0ea97b3bf4d09819ce17d87acb579bd4d34a99e06e9b48254d7a0b60e`
`font_02_sfnt_off0001088f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1088F	10804 bytes
SHA-256: `3c8b0c909ebdd7035652671234c59518b10fd9210cd6273a4e678b79208a56db`

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