PDF malware analysis — malicious · aa8c4fa88adc2eaf

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 18:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 95350cc4477e5a9b69f3183345c07ea1 SHA-1: f945affcf6203e7ea58055908d121ee710d4b208 SHA-256: aa8c4fa88adc2eaf5dffd43e88f661a88e6fdde2b2223888148426b038c73904

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the document structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://pistant.ru/uplcv?utm_term=helium+backup+android+10 PDF link annotation
- http://progettogeometra.it/userfiles/files/safedexu.pdfIn PDF document text
- http://medi-sen.com/files/files/7199706614.pdfIn PDF document text
- https://yomadesign.com/userfiles/Proj_Name/files/67000366462.pdfIn PDF document text
- https://marikakozmetika.hu/editor_up/88377151954.pdfIn PDF document text
- http://actlogistic.vn/upload/editor/files/36180840437.pdfIn PDF document text
- http://kubablimel.pl/Image/files/44032103008.pdfIn PDF document text
- https://systematix.pl/userfiles/file/sajalasenitexejewozuku.pdfIn PDF document text
- http://helder-effect.nl/userfiles/file/89666623580.pdfIn PDF document text
- https://dodatnagarancija.com/userfiles/file/vudofidiperufej.pdfIn PDF document text
- http://contua.org/userfiles/file/83005516415.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/120511664ae45549067ac1c72e42fdff/busavusotoniduvizetojin.pdfIn PDF document text
- http://popmetre.com/news/files/64346261246.pdfIn PDF document text
- https://habrit.tw/ckfinder/userfiles/files/mugirikukoxatapaxir.pdfIn PDF document text
- https://karinbentum.nl/uploads/file/zogepopu.pdfIn PDF document text
- http://leeandrewdavison.com/download/vawoni.pdfIn PDF document text
- http://thy-environment.com/userfiles/files/gexofofobekufifadodokuzup.pdfIn PDF document text
- https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/27498223660.pdfIn PDF document text
- http://aeon-dev.com/uploads/files/202109140912578608.pdfIn PDF document text
- http://zatexpress.com/upload/userfiles/files/16815579757.pdfIn PDF document text
- https://gres-k.cat/userfiles/file/gotiramupatazuzituxuxezeg.pdfIn PDF document text
- http://tplustech.com/images/ckeditor/files/6946712356.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/mefotez.pdfIn PDF document text
- http://radio6deenero.com/uploaded/files/fizulukobadamugo.pdfIn PDF document text
- http://jedwines.com/cmsCart/upload/file/potekibu.pdfIn PDF document text
- https://jpt.mysmartedu.com/uploadimages/files/tuwevatalujupifipupanakux.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_off0000d7f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7F3	10904 bytes
SHA-256: `fc3d5714a5adc1a1252a640e0b7611c76d56b3a5410b203ea0f24ca3828c8aa2`
`font_01_sfnt_off0000f0d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0D6	16160 bytes
SHA-256: `e5af8a4b951549997d4e843eaa962b243d707973a2d61ff46c4bc2ce5a67af27`
`font_02_sfnt_off00011ab3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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