PDF malware analysis — malicious · 14a9cab164c18034

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 21:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 56d8ac29e97958d2f52e5b822ebf37e7 SHA-1: 9d413a1c3e5a721ff0156807ef0fdca94ccbc9b7 SHA-256: 14a9cab164c18034a61beaa88c832e504f807a096cf5943be5685b463d77c1ce

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and external URIs pointing to suspicious domains, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=crash+3+tiny+tiger PDF link annotation
- http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28936380950.pdfIn PDF document text
- http://snsi.jp/image/news_file/fuzumurejodixuja.pdfIn PDF document text
- https://theurbanthinktank.com/files/gilutobufijozatixopugut.pdfIn PDF document text
- http://aminotp.com/upload/files/82563637539.pdfIn PDF document text
- http://fobas.cz/userfiles/file/71122205014.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/dikixodinav.pdfIn PDF document text
- https://aadharshilaschool.org/userfiles/file/80356304264.pdfIn PDF document text
- http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/polukefajob.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/telarupubukog.pdfIn PDF document text
- http://pcccmiennam.com/media/ftp/file/nagijubiful.pdfIn PDF document text
- https://demetraproject.eu/ckfinder/userfiles/files/28140189475.pdfIn PDF document text
- http://dolphinkorea.com/files/files/20553536517.pdfIn PDF document text
- https://smilaxlabs.com/userfiles/files/30959489721.pdfIn PDF document text
- http://neoclassicalmansions.com/uplds/file/25383915419.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d219bc58---zefesopibiwew.pdfIn PDF document text
- https://www.comperat-89.fr/ckfinder/userfiles/files/napazosu.pdfIn PDF document text
- https://karapinler.com/calisma2/files/uploads/jaxazotesew.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/37643936540.pdfIn PDF document text
- http://starcity-vinhomes.vn/app/webroot/img/files/35239424529.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/23b55706f15cb58cf8762f952107d4d4/susak.pdfIn PDF document text
- http://dkyangmei.com/uploadfile/file/2021090505343073499.pdfIn PDF document text
- http://vagtteam.com/userfiles/Files/17512959263.pdfIn PDF document text
- http://wsm.hk/images/files/51149698370.pdfIn PDF document text
- http://rayer.cn/d/files/wiregajagekefetofira.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_off0000cfbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFBB	10540 bytes
SHA-256: `a4d79532022cc8aba4a033ca94e05b014296ba40f45658e450a3bfc494260ef8`
`font_01_sfnt_off0000e7c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7C0	19184 bytes
SHA-256: `e126d637d48e726bcf0c28e02025aa58ef25511b29e94c290b0fee9b1d60e7be`
`font_02_sfnt_off000119b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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