PDF malware analysis — malicious · 178b32d73f386ae9

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 00:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 59614015d6b023b79979210c5ea356a5 SHA-1: b47cf980c4026747dcbc740f5bf4826eb5fc92b2 SHA-256: 178b32d73f386ae96dfa58684e1d8ae32b4a9b80180efae21c9220aef300e920

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obscure the ultimate destination or distribute payloads across multiple sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

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 http://hongpakthai.com/ckfinder/userfiles/files/wolovezenovotogovokataj.pdf In PDF document text
- https://andhimazhai.com/images/files/52183296580.pdfIn PDF document text
- http://stellamaris.cz/userfiles/54609404739.pdfIn PDF document text
- http://gold-carsales.com/js/upload/files/21817442826.pdfIn PDF document text
- http://confidenzacsapagy.hu/upload/76156835.pdfIn PDF document text
- http://chengzechem.com/upload/files/20413028828.pdfIn PDF document text
- http://dges.in/userfiles/file/rutimumaninobenen.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d21284df9---vugawumukabesefudalam.pdfIn PDF document text
- http://blessingsngo.in/userfiles/files/53289102614.pdfIn PDF document text
- http://de-ko-gmbh.com/ckfinder/userfiles/files/51171620972.pdfIn PDF document text
- https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/kipominemozigupo.pdfIn PDF document text
- https://argumentua.com/i/file/61668759267.pdfIn PDF document text
- https://aldurra.ly/images-editeur/img/file/zeninowimi.pdfIn PDF document text
- https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/jobavibasupidotonidi.pdfIn PDF document text
- https://pulsekb.ru/admin/ckfinder/userfiles/files/1952123522.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/rajefadazitoxeluxeninij.pdfIn PDF document text
- http://taiwan-tsai.com/upload/files/17843682504.pdfIn PDF document text
- http://chinastom.ru/userfiles/file/bosizuxozitu.pdfIn PDF document text
- http://clean-ecology.com/Upload/files/piwaxod.pdfIn PDF document text
- https://keiba-like.biz/js/ckfinder/userfiles/files/28668966700.pdfIn PDF document text
- https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/36550033680.pdfIn PDF document text
- https://www.cascatai.com.br/ckfinder/userfiles/files/xobasavasivixojakifunux.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=photoshop+torrent+windows+10PDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e392.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE392	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fba4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBA4	18520 bytes
SHA-256: `94d7c9a174d52a44aee80fc8791a33f9a578d49294f1ac9c5c52534040a7e701`
`font_02_sfnt_off00012b44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B44	2944 bytes
SHA-256: `c7898f1a5e4aff565ade6167ebaed1d082969eb8dbe7b5be03bb108e1e371748`
`font_03_sfnt_off0001377d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1377D	10544 bytes
SHA-256: `9ad798328dbb882853b8d5bfae65f1667e14883cc2f7515e6279afe67974b8bb`

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