PDF malware analysis — malicious · 87d9132ac5a2d1b6

MALICIOUS

PDF

80.4 KB Created: 2021-10-05 04:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: b68c6552077108bc728658a471cb86aa SHA-1: f285d8079f8c85aac128f64bb97d4f231bbd049c SHA-256: 87d9132ac5a2d1b65febbd52dffe7a08d8086946f2af2f787ddb98ed83e9a80a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. Heuristics suggest it acts as a link farm and a fake invoice lure, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

Heuristics 7

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
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://crysiq.ru/uplcv?utm_term=crystal+report+substring PDF link annotation
- http://baoveantam.org/upload/files/sevegusulumexez.pdfIn PDF document text
- https://nasco-ye.com/uploads/file/mebodupamiv.pdfIn PDF document text
- http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/famogokafixasizarofowarup.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/90675899380.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7d0e9f804---jemabavegixira.pdfIn PDF document text
- http://matchonusa.com/uploads/files/37129383763.pdfIn PDF document text
- https://mosallaesf.ir/uploads/ck/files/80819753338.pdfIn PDF document text
- http://sun-green.eu/ckfinder/userfiles/files/miwujisozumamuxiber.pdfIn PDF document text
- http://larben.cz/media/images/upload/file/96793759399.pdfIn PDF document text
- https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/97621788932.pdfIn PDF document text
- http://geologicatoscana.eu/userfiles/files/zelituluvasinoru.pdfIn PDF document text
- http://rrbrentacars.com/files/others/83128934119.pdfIn PDF document text
- http://daiichihousing.net/uploads/news_file/89074078337.pdfIn PDF document text
- http://leoclubmarsala.it/userfiles/files/kewizomalevexigipup.pdfIn PDF document text
- https://foodvellythailand.com/upload/files/gizubunilunedikakin.pdfIn PDF document text
- https://mm-podium.ro/userfiles/file/kavezakurefeje.pdfIn PDF document text
- http://icoenergia.com/userfiles/files/61902196862.pdfIn PDF document text
- http://wamaeassociates.com/images/uploads/originals/file/ralejobaxeza.pdfIn PDF document text
- http://alda.pl/ckfinder/userfiles/files/lepubewokezanemovadojil.pdfIn PDF document text
- http://easytravel63.ru/ckfinder/userfiles/files/nomapevasuxi.pdfIn PDF document text
- http://makesomenoise.hu/upload/file/naniwomu.pdfIn PDF document text
- http://kingkady.com/uploadfile/files/95344316069.pdfIn PDF document text
- http://iscelenie.info/files/file/97207628968.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_off0000d095.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD095	10812 bytes
SHA-256: `64d81badd0a7c2144947432de8853d9feea151fc3defbb3b900a28490ccad5f5`
`font_01_sfnt_off0000e96e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE96E	19232 bytes
SHA-256: `dbed2bd5f0fc2609802c7c9a9684ba1731fd26adecbe5c5f8797766f406a4d2c`
`font_02_sfnt_off00011c01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C01	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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