PDF malware analysis — malicious · 8076307aca93154d

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 21:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: dd945efa4005dcd58c178e5a6ad929ba SHA-1: b8f9c86787d054f2168624bc592b1398447128f6 SHA-256: 8076307aca93154de5ede82b761031f4bce82701a0b88dd00972a24804129cd5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it is a Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external URIs suggests the document is designed to redirect users to malicious sites or download further malicious content. The PDF's structure and the nature of the URLs point towards a phishing or malware distribution campaign.

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 https://queure.ru/uplcv?utm_term=delete+call+recording+recovery+app PDF link annotation
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c294a00302---remixulotu.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/112ba48bed16a885acd0a2ba50163de6/57414530079.pdfIn PDF document text
- http://apsons.eu/files/file/54749648758.pdfIn PDF document text
- https://producto.works/userfiles/file/zekavifelapaw.pdfIn PDF document text
- https://huanghecables.com/d/files/90131623648.pdfIn PDF document text
- http://dalnoboy.net/data/filestorage/upload/files/77354006322.pdfIn PDF document text
- https://europacreativaeuskadi.eu/files/galeria/files/nogekimezaxewamiralufetu.pdfIn PDF document text
- http://gocoachfox.com/userfiles/file/duxazimiluxu.pdfIn PDF document text
- http://sunway.me/uploads/file/140341243308.pdfIn PDF document text
- https://2-view.org/home/view/public_html/ckfinder/userfiles/files/58183848977.pdfIn PDF document text
- http://rulada.by/upload/editor/files/nigolopupelizid.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/noxogizatekelakemekufora.pdfIn PDF document text
- http://harposwebdesign.nl/app/webroot/files/userfiles/files/vemij.pdfIn PDF document text
- http://hodori247.com/uploads/files/jujujubojagifidijisusuguj.pdfIn PDF document text
- http://galantemontagnana.it/ckfinder/userfiles/files/67889243860.pdfIn PDF document text
- http://hanasushimenifee.com/uploads/files/buparesukeselibipawop.pdfIn PDF document text
- https://locktactyuma.com/userfiles/file/37787321727.pdfIn PDF document text
- https://membermimpi.com/contents/files/monapadadepizajukubodu.pdfIn PDF document text
- https://landatur.com/files/galeria/files/lasetudujamawalawij.pdfIn PDF document text
- http://eortak.com/img/fck_temp/file/58099198055.pdfIn PDF document text
- http://sharon-barron.com/userfiles/files/56395382813.pdfIn PDF document text
- http://4grd.com/cmsimages/file/97041739963.pdfIn PDF document text
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/19626815939.pdfIn PDF document text
- http://sprinter-lab.ru/content/File/47782040061.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_off0000d80e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD80E	10700 bytes
SHA-256: `1198046abcb8994d486f90069d507e234943facba86454d805531531ca361713`
`font_01_sfnt_off0000f081.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF081	18372 bytes
SHA-256: `e7e2e11b68e52d46e9fad925ce76ce973f2e35e23c102e3f6db7f644312ed687`
`font_02_sfnt_off00012000.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12000	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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