PDF malware analysis — malicious · e179140c0cedd19b

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 20:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 39a0fd6645eb4d52d482fceef3478c65 SHA-1: aa90ffe50012ea8a51883c6eeaae6482279b8205 SHA-256: e179140c0cedd19be4a46912214ac7c7c05a2b3c08567f01909e84f38c17ef5a

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://crewmak.ru/uplcv?utm_term=ola+party+live+streaming PDF link annotation
- https://alaskaproauto.net/nbloom/fckuploads/file/nonoxu.pdfIn PDF document text
- https://uleiuri.ro/userfiles/file/17817178565.pdfIn PDF document text
- https://hoangphatdanang.com/uploads/image/files/wafidopavepuroxakibuzi.pdfIn PDF document text
- http://andrelandberg.com/userfiles/file/dofuvodanekenibifubufak.pdfIn PDF document text
- http://the100voicesofgospel.de/fichiers/newsletter/file/61724860194.pdfIn PDF document text
- https://pokereshop.cz/data/file/girotarefibemanox.pdfIn PDF document text
- http://emke.hu/uploads/ckfinder/userfiles/files/pijujaxinuzefoto.pdfIn PDF document text
- https://hopadive.cz/ckfinder/userfiles/files/52453072719.pdfIn PDF document text
- http://lnshiyue.com/userfiles/file/20210908154634_1439924160.pdfIn PDF document text
- http://ahkjt.com/upfile/file/676499267.pdfIn PDF document text
- http://www.juniorcollege.cl/ckfinder/userfiles/files/27548378733.pdfIn PDF document text
- https://tabularasa.lv/sites/tabularasa/uploads/documents/files/pububurizome.pdfIn PDF document text
- https://samsungklimalar.com/upload/ckfinder/files/78143979582.pdfIn PDF document text
- http://brickform.cz/obrazky/files/22127336491.pdfIn PDF document text
- https://haysalon.com/public_html/userfiles/file/12505537083.pdfIn PDF document text
- http://writtenmail.com/upload_images/file/sofaburikiwolizulorivud.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a45d60610a536871987884b59a3018e5/bajezefanoruwu.pdfIn PDF document text
- http://www.mariabeckmann.com/fotos/uploads/files/81405756621.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368644e535d---34280817026.pdfIn PDF document text
- http://mwbright.com/upload_fck/file/2021-9-9/20210909235917861275.pdfIn PDF document text
- http://czernavendeghaz.hu/admin1/file/dewuwivopoza.pdfIn PDF document text
- http://araratmebel.ru/img/file/75892563564.pdfIn PDF document text
- https://lean-ds.com/upload/editor/file/lejiditivoxuzujilopipes.pdfIn PDF document text
- https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/67186165918.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_off0000dfb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFB0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f7c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7C7	10680 bytes
SHA-256: `9f0cdd3dc7f7dea6d10ed12adacda6b6c046afecec2afb4e9e434ba07d0dae51`
`font_02_sfnt_off00011060.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11060	17360 bytes
SHA-256: `26332d768b12e40342f19501a5ba7a4c42d375e7c5aaa2d9230579e9e1e0ce18`

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