PDF malware analysis — malicious · edf5e9fc0f6e24c9

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 15:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4d6ef93cff905f8bdcdce8f42409bacf SHA-1: e33648c316c135f21f8b2421d9ed50cae3b590b9 SHA-256: edf5e9fc0f6e24c95dbfe3e5f10b3e6a8b97ddaf801e2404cd21ca608f1d54d3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The document's structure and the presence of many external URIs suggest an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

Heuristics 5

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.
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://nomylo.ru/uplcv?utm_term=minna+no+nihongo+2+pdf PDF link annotation
- http://toanlinh.vn/upload/files/ruger.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377788bc5b9---35845799801.pdfIn PDF document text
- https://gogreenonline.net/userfiles/image/fckeditor/file/gemudazedifegavajeneko.pdfIn PDF document text
- https://ecotranslation.ca/upload/editor/file/duwixidanokuxazibafekozi.pdfIn PDF document text
- http://shinyoungvalve.com/userData/board/file/nojajemagiluzukarugezat.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0d5766e3---74927277163.pdfIn PDF document text
- https://ozora.schaffsen.com/contents/file/dubejobemakanofigilub.pdfIn PDF document text
- http://sro52.ru/uploads/files/felukexamobasa.pdfIn PDF document text
- http://zvezda-rostov.ru/ckfinder/userfiles/files/sivojizapedifilibomire.pdfIn PDF document text
- https://atrax.eu/userfiles/file/puwetozoziveki.pdfIn PDF document text
- https://halkum.rs/files/sogutulegebipu.pdfIn PDF document text
- http://ge-mak.com/files/nuxadagitaziridavavokazav.pdfIn PDF document text
- http://dastone.ru/userfiles/file/ruleduja.pdfIn PDF document text
- http://www.otevrenysklep.cz/ckfinder/userfiles/files/wobokuwemevevimozu.pdfIn PDF document text
- http://phongthuyphatloc.com/luutru/files/84007363388.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/38254640585.pdfIn PDF document text
- http://lmleadmanagement.com/userfiles/files/mefibilam.pdfIn PDF document text
- http://usmleworkout.com/files/file/9291463264.pdfIn PDF document text
- https://mumegram.com/userfiles/file/padonijegomovexusipurovin.pdfIn PDF document text
- https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/gelodi.pdfIn PDF document text
- https://ubk-sad.de/azubi/userfiles/files/kamevikaxa.pdfIn PDF document text
- http://dga.gr/ILC/img/file/53714756314.pdfIn PDF document text
- http://german-ex.com/images/blog/file/75097178234.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/rijojuguromafilitonodavor.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000beac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEAC	21208 bytes
SHA-256: `7a07785ad09d3e374aa3b324a102d0609cde91c6294de98573f5852f78ec937f`
`font_01_sfnt_off0000f333.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF333	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B4A	10344 bytes
SHA-256: `a87db6ab0ccef33eadce29153dd35b7dccc39e51a65df6914bc1a3901e92744d`
`font_03_sfnt_off00012253.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12253	16132 bytes
SHA-256: `071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137`

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