PDF malware analysis — malicious · d2280b3d84b9e7bd

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 10:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 265a9c7f1878ac525fb78da658502240 SHA-1: caf10740d03f5ff48044c02aec851eaf840ced05 SHA-256: d2280b3d84b9e7bde83ed5ef02f519162d47a18fcf2019a55fffc97d76afd0be

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://congtrinhnhaviet.vn/upload/files/sikili.pdf In PDF document text
- http://www.videobezopasnost.ru/ckfinder/userfiles/files/80358201035.pdfIn PDF document text
- http://solarwindependence.com/ckfinder/userfiles/files/simuvopexafowejofiban.pdfIn PDF document text
- http://s-privod.ru/userfiles/file/7691910737.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/kesotagow.pdfIn PDF document text
- https://stiglic.sk/userfiles/file/5234919918.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/68360403518.pdfIn PDF document text
- http://iknow.pl/files/file/vinebolofonijadabifi.pdfIn PDF document text
- http://chornakorn-packing.com/ckfinder/userfiles/files/mujakexu.pdfIn PDF document text
- http://n-production.com/upload/fckeditor/file/47017256132.pdfIn PDF document text
- http://seidels-mineralienwelt.de/images/uploaded/file/40380470592.pdfIn PDF document text
- http://michalpavlicek.com/uploaded/file/jewole.pdfIn PDF document text
- http://garageanything.com/js/upload/files/zodetefasidinemudafefotu.pdfIn PDF document text
- http://dentali.cz/files/files/bavivu.pdfIn PDF document text
- https://songhongresort.com/img/files/78781164797.pdfIn PDF document text
- https://juniorclublivorno.com/sitonews/images_upload/files/lufemoku.pdfIn PDF document text
- http://splhardware.com/UploadFile/file/2021090109325373499.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d4a66e7---lufewadegubupa.pdfIn PDF document text
- http://studiosantese.eu/userfiles/files/nejepuxesewu.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/l1l0b4ffsoetpi7d5bo7r0lcd7/terone.pdfIn PDF document text
- http://yuh-tarng.com/userfiles/file/15836919370.pdfIn PDF document text
- https://brianhigbielaw.com/UserFiles/file/werawinupazabubodis.pdfIn PDF document text
- https://mlspoland.co/files/file/mexeguveweromuf.pdfIn PDF document text
- http://gostinica-domodedovo.ru/files/32848309427.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ww0+0gomovies+to+download+gomovies+appPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e636.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE636	10904 bytes
SHA-256: `5626b1c5d5ed3e968ed9b9320770b7b6fe21048bd2667f1c8b84da9f37fef019`
`font_01_sfnt_off0000ff48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001175a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1175A	18132 bytes
SHA-256: `255e1933b54a80ef9cdfbeb5de62c74c7b86f8d8cef017e6cb780c953d0e6c64`

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